>>2202966>>2202983Works great for rather simple and flat pics (haven't tested for the ones with sophisticated colouring, lighting and shading yet but will try for next post):
>save a simple pic in 2/4/8-bit depth, whatever looks better, same for dithering (I'd recommend for the result to be mostly monotonous, but, experiment at your amusement) but that's not the final product yet>copy-paste some specific details you want to be highlighted from the original to same position on a new layer, make each of those details monotonous in colour (use magic selector tool to select them properly)>save with applying the color depth and dithering levels again to your taste>fix anything that sticks out>???>PROFITThanks for the original idea OP
Pre-edited pic is at
https://safebooru.org/index.php?page=post&s=view&id=3395255 