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deepgreenravine.bsky.social
deepgreenravine
@deepgreenravine.bsky.social
720 followers 370 following 340 posts
hannah cohen (they/them) • scientific illustrator • fine artist • working in traditional media • www.deepgreenravine.com
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deepgreenravine.bsky.social
hi all - this is a little last-minute, but since I’m back here on Bluesky I figured I’d share! tomorrow I start teaching an 8-week online course on fish anatomy for artists through the Lyme Art Association. if it fits into your schedule, please join me! lymeartassociation.org/online-class...
This graphic depicts a drawing of shark teeth and shares some information about the course, which takes place online on Wednesdays from 530p-8p EST and runs from 9/17-11/5. #sciart This is a colored pencil drawing of an anglerfish on black paper. This is a black-and-white pen drawing of a Rio Grande silvery minnow, labeled with its common name and its scientific name (Hybognathus amarus) as well as its average size (3.5” in length). This is an infographic about the bowmouth guitarfish (Rhina ancylostoma) and its dentition. Drawings show the whole animal, a ventral view of its mouth and gills, and its jawbones. Text reads as follows: The bowmouth guitarfish is a large demersal fish native to the warm waters of the Indo-West Pacific Ocean. These unique fish are unfortunately critically endangered, but they generally fare well in captivity and can be seen in aquariums around the world. Despite their elongated bodies, bowmouth guitarfish are rays. Adults may approach 9’ in length. They are armored for sally with ridges of bony thorns over their eyes and along their backs, and dappled with lighter spots. As with other rays, the guitarfish’s mouth, nose, and gills are positioned ventrally - on the underside of its head. Bowmouths feed on smaller seafloor dwellers: crustaceans, mollusks, and other fish. To accommodate this crunchy and well-armored diet, the bowmouth guitarfish’s teeth are modified into wavy bands of flat, blunt crushing plates.
September 16, 2025 at 7:50 PM
deepgreenravine.bsky.social
Remember when I said I needed to draw more newts? This marbled newt (Triturus marmoratus) is small, but now I have the itch. I definitely need to add more amphibians to my repertoire!

This drawing was made with watercolor and colored pencil.
This is a small illustration of a marbled newt. It is a lizard like amphibian, green in color with black spots and bumps of various sizes and a vivid orange stripe along its back. #sciart
April 29, 2025 at 3:37 PM
deepgreenravine.bsky.social
i am not exaggerating when i tell you that i think abt this triumph of #sciart at least once a week.
This is a simple black and white drawing of a friendly looking rat wearing an undergarment that looks extremely itchy. The caption reads: “Fig. 1. The underpant worn by the rat.”
April 22, 2025 at 5:37 AM
deepgreenravine.bsky.social
(reposting due to a typo)

Happy #fossilfriday! Here’s an assortment of shark teeth (fossil and contemporary) from my collection, accompanied by a small plastic tiger shark. I pulled the bull shark tooth off the seafloor myself!

This drawing was made with watercolor and colored pencil. #sciart
This image features an assortment of shark teeth of various sizes and shapes against a white background. This image labels all of the teeth with the species to which they belong, as follows. Fossil: 1) tiger shark (Galeocerdo sp.) 2+3) crow shark (Squalicorax pristodontus) 4) white shark (Carcharodon planus) 5) megalodon (Otodus megalodon) 6) requiem shark (Physogaleus contortus) 7) mackerel shark (Otodus obliquus) Contemporary: 8) mako shark (Isurus sp.) 9) bull shark (Carcharhinus leucas)
April 19, 2025 at 6:27 PM
deepgreenravine.bsky.social
Colorado hydrological map / graphite and digital / 2025

Here it is, folks - my first map is finished (for now)! This is a pretty comprehensive look at the various and sundry bodies of water crisscrossing my beautiful home state. This map will be part of an upcoming field guide project! Stay tuned 👀
This is a topographical map of the state of Colorado, with rivers, lakes, streams, reservoirs, and other bodies of water drawn in a deep teal blue. #sciart
April 8, 2025 at 5:47 AM
deepgreenravine.bsky.social
map update! more tributaries and more of CO’s larger and most recognizable waterways.
This is a photo of a computer screen. A map of Colorado’s rivers, streams, and lakes can be seen in progress in Photoshop. The map is topographical and hand drawn in graphite; the waterways are being added digitally in a deep greenish blue. #sciart
March 30, 2025 at 4:55 PM
deepgreenravine.bsky.social
:’) here’s an update!
March 29, 2025 at 8:31 PM
deepgreenravine.bsky.social
Map progress! I’m currently digitally adding CO’s many beautiful rivers, streams, creeks, seeps, lakes, reservoirs, and other various and sundry bodies of water to this map of our topography. This is the first map I’ve ever made, and I’m genuinely loving the process!
This is a photo of a computer screen. Photoshop is open, displaying a graphite topographic map. Waterways are being added digitally in a teal blue color. #sciart
March 23, 2025 at 11:16 PM
deepgreenravine.bsky.social
anyways! i reposted this not so long ago but i’m proud to announce that the star of this piece has successfully survived the winter. i dug her up a couple weeks ago and her color is back! shaping will come soon.
This is an image of a small Juniper procumbens #bonsai sitting on a brick ledge, aglow and basking in full sun.
March 19, 2025 at 4:08 AM
deepgreenravine.bsky.social
I humbly present my topographical map of Colorado! This map was drawn by hand in graphite from a satellite image. It is not finished (it has a final purpose involving more components) but the topography itself is complete!
This is the map. Colorado is a rectangular state, but the map itself is bowed slightly to indicate the curvature of the earth as a whole. The graphite is pale and relatively low contrast. The front range extends roughly down the middle of the map. The west is dense and mountainous, with the Rockies running north to south. To the east, we see the flatter and paler plains. #sciart
March 15, 2025 at 5:04 AM
deepgreenravine.bsky.social
send help!!!!!!
March 13, 2025 at 8:59 PM
deepgreenravine.bsky.social
i’ve never seen a map like the one i want for one of my current projects, so i’m making my own! once i leave the front range behind, the rest will go much more quickly 😉
This is roughly 1/3 of a hand drawn topographical map of the state of Colorado. It is mountainous and heavily textured. #sciart
March 9, 2025 at 6:20 AM
deepgreenravine.bsky.social
One of the purposes of this diagram is to serve as sample
work for a vertebrate anatomy course I’ll be teaching in a little over a month! The course is online, through the Lyme Art Association. I’d love to see you there! #sciart
This image shows a graphite drawing of an armadillo sitting on a wooden table surrounded by arrow plant leaves. It reads as follows: Online Natural Science Illustration Courses Vertebrate Anatomy for Artists with Hannah Cohen starting April 15 Register today at LymeArtAssociation.org
March 2, 2025 at 7:36 PM
deepgreenravine.bsky.social
bowmouth guitarfish (Rhina ancylostoma) dentition diagram / colored pencil on Duralar; text in Photoshop / 2025

Last October, while traveling, we visited the London Aquarium, where we saw their resident bowmouth, Betty. I had never seen one before and I fell totally in love!
bowmouth guitarfish (Rhina ancylostoma) The bowmouth guitarfish is a large demersal fish native to the warm waters of the Indo-West Pacific Ocean. These unique fish are unfortunately critically endangered, but they generally fare well in captivity and can be seen in aquariums around the world. In the bottom left of the page is a drawing of the whole bowmouth guitarfish. It is a deep brown-grey. The text to the left of the drawing reads as follows: Despite their elongated bodies, bowmouth guitarfish are rays. Adults may approach 9’ in length. They are armored dorsally with ridges of bony thorns over their eyes and along their backs, and dappled with lighter spots. In the center of the page is a closer view of the pale underside of the bowmouth’s head. The text to the left of this drawing reads as follows: As with other rays, the guitarfish’s mouth, nose, and gills are positioned ventrally - on the underside of its head. Bowmouths feed on smaller seafloor dwellers: crustaceans, mollusks, and other fish. Below this drawing and to the right is a drawing of the bowmouth’s jaws and teeth alone. The text to the right of this drawing reads as follows: To accommodate this crunchy and well-armored diet, the bowmouth guitarfish’s teeth are modified into wavy bands of flat, blunt crushing plates. #sciart This is the drawing of the whole bowmouth guitarfish. This is the drawing of the underside of the guitarfish. This is the drawing of the guitarfish’s jaws and teeth.
March 2, 2025 at 7:31 PM
deepgreenravine.bsky.social
this is my beautiful daughter! she is finally finished. this drawing was a huge lesson and i’m so grateful to have spent so much time w it. bowmouth guitarfish are really extraordinary animals. i will share the whole piece tomorrow!
This is a drawing of a bowmouth guitarfish. These animals are large, shark like fish with large pectoral fins, but they are actually rays. They have light dappled spots and thick ridges of bony spurs over each eye and along their backs. #sciart
March 2, 2025 at 4:35 AM
deepgreenravine.bsky.social
Rio Grande silvery minnow (Hybognathus amarus) / pen on 9x12 Duralar / 2024

Too late for #FishyFriday? Maybe #CyprinidSaturday? It was a joy to complete this for a special project (more to be revealed) and to learn abt these beautiful little fish and the conservation efforts surrounding them.
This is a pen drawing of a small minnow, shaded with stippling. The fins are delicate and semi translucent. The shine on the minnow’s scales is evident. The fish is labeled as a Rio Grande Silvery Minnow (Hybognathus amarus) and measured at 3.5” in length. #sciart
February 22, 2025 at 8:50 PM
deepgreenravine.bsky.social
not to worry - i still live! as proof here is a photo of my dog Halo. she likes to sleep like this. we call this pose The Belly Bug and whenever we see her Belly Bugging we scream BELLY BUG and descend upon her to pet her and she wiggles around on her back like a creature
February 22, 2025 at 5:00 AM
deepgreenravine.bsky.social
everyone loves this meme and now it has me thinking abt salamanders!! i did this one literally forever ago. i don’t love the rest of the piece, but i do still genuinely adore this guy in his little bubble of water. i should paint more #salamanders. and more bubbles.
This is a WIP! The only completed portion is a bright red-orange salamander in a bubble of green water against a grey background. #sciart
February 18, 2025 at 7:08 PM
deepgreenravine.bsky.social
:D
February 18, 2025 at 2:59 PM
deepgreenravine.bsky.social
incidentally, last year this original was sold at the annual gala held by the Denver Museum of Contemporary Art, with all proceeds benefiting the museum! the museum framed it themselves and it looked ~so nice~
This is a photograph of the same art of the butterfly and the chokecherry, framed in a white frame and hung on a white wall. Shadows of observers are cast on the wall.
February 17, 2025 at 11:50 PM
deepgreenravine.bsky.social
swallowtail and chokecherry / colored pencil on 14x17 Duralar / 2023

Here we have a swallowtail butterfly (Papilio multicaudata) throughout multiple stages of its life - egg, caterpillar, chrysalis, and imago - perched on a branch of its host plant, the chokecherry tree (Prunus virginiana)!
This is the drawing in its entirety. #sciart This is a close crop of the adult butterfly, or imago, and a chrysalis. This is a close crop of a cluster of chokecherries. This is a close crop of a caterpillar - and of a tiny egg on a leaf!
February 16, 2025 at 8:07 PM
deepgreenravine.bsky.social
in the meantime, here is a poem by Wendell Berry. it is beautiful and it makes me feel better. i hope you like it too.
Manifesto: The Mad Farmer Liberation Front Love the quick profit, the annual raise, vacation with pay. Want more of everything ready-made. Be afraid to know your neighbors and to die. And you will have a window in your head. Not even your future will be a mystery any more. Your mind will be punched in a card and shut away in a little drawer. When they want you to buy something they will call you. When they want you to die for profit they will let you know. So, friends, every day do something that won’t compute. Love the Lord. Love the world. Work for nothing. Take all that you have and be poor. Love someone who does not deserve it. Denounce the government and embrace the flag. Hope to live in that free republic for which it stands. Give your approval to all you cannot understand. Praise ignorance, for what man has not encountered he has not destroyed. Ask the questions that have no answers. Invest in the millennium. Plant sequoias. Say that your main crop is the forest that you did not plant, that you will not live to harvest. Say that the leaves are harvested when they have rotted into the mold. Call that profit. Prophesy such returns. Put your faith in the two inches of humus that will build under the trees every thousand years. Listen to carrion - put your ear close, and hear the faint chattering of the songs that are to come. Expect the end of the world. Laugh. Laughter is immeasurable. Be joyful though you have considered all the facts. So long as women do not go cheap for power. please women more than men. Ask yourself: Will this satisfy a woman satisfied to bear a child? Will this disturb the sleep of a woman near to giving birth? Go with your love to the fields. Lie down in the shade. Rest your head in her lap. Swear allegiance to what is biggest your thoughts. As soon as the generals and the politicos can predict the motions of your mind, lose it. Leave it as a sign to mark the false trail, the way you didn’t go. Be like the fox who makes more tracks than necessary, some in the wrong direction. Practice resurrection. -Wendell Berry
February 16, 2025 at 5:40 AM
deepgreenravine.bsky.social
the afterlife of you and me / ink on 9x12 paper / 2021

Happy #valentinesday! This is an old drawing (maybe I’ll redo it soon?) of The Lovers of Valdaro - two sets of 6,000-year-old remains found snuggled up in a Neolithic tomb near Mantua, Italy. That’s romance!
This is an ink drawing of two weathered partial skeletons; viewed from the top down, they embrace in the soil where they were found. The bones are pink; the soil is a reddish purple. #sciart
February 14, 2025 at 3:06 PM
deepgreenravine.bsky.social
hey, i know her! i think maybe i’ve already shared this illustration i made of the same species (Melanocetus johnsonii). finding good visual information for the piece was tricky, since these guys are spotted so rarely. i’m gratified to see that my drawing is accurate - this video is bonkers!
A drawing of a humpback anglerfish on black paper, illuminated only by its own bioluminescent lure. The drawing is very dark and shadowy. #sciart
February 11, 2025 at 7:37 PM
deepgreenravine.bsky.social
go birds!
February 11, 2025 at 7:28 PM