This is a 1:1 paint size (1 layer) Yule bot from 2008 and Cortex Command (Imperatus faction). I did various stuff for that game.
Red dots are chromatic abberation fakery just to liven things up. Then there are some blue reflections and fog. The saturated brown terminator (light | dark) edges on the sack also helps to make it look less muddy. It's hard to define/design details when painting it in a single layer, I find, so it ends up being more suggestive. I mostly used a round brush at some 40-60% opacity then, as a means of blending.