My eye shader isn't perfect yet, it's just une simple PBR material with clearcoat.
Here's a slightly improved version, but I'm not completely happy with the result.

Thanks, I'm trying to follow the path laid out by older games like Doom, Half-Life, ...

You can look for ARkit blendshapes ;) arkit-face-blendshapes.com

No tutorial, but for this video :
- I used Blender and Human Generator 3D with a big custom clean/setup/export script
- I used ElevenLabs for the voice
- I'm using SAiD library to convert the wav to blendshapes coeffs
- And finally importing everything in the engine

I have 51 face position (jaw opened, smiling, left eye closed right right closed, ....) and I mix each face positions (blend shapes) with a coefficient generated by a Wav to ARKit soft.

Thanks :)