I found the posters on broheim. Printed them out used some leftovers of my wife’s tea to give color. Then watered down PVA glue to stick them on. They may need a second coat of watered down PVA after the first dries if they warp a little. The graffiti is from a paint pen.

It’s all about the under coat. Stipple whatever colors you want after the prime. Then just brush with whatever greys you have available. Looks janky at first but it helps add depth and color deviation to the brick.

Thanks trying to find that fine line of playability and looks.