Thanks Saint. No, it's just a bunch of thin layers and strokes of different colours, one atop the other. I've done the eye, so here's more of a closeup where you can see all the strokes.
Here he is so far (a few more bits added). The top isn't going to be that sickly yellow, it'll be dirtier than that I think.
The eye so far. Here you can see some of the different colours in there, particularly in the upper lip. There's a mix of greens, yellows, red/purple, blue, black, and brown. Basically everything!
Little spots on his forehead. I thought they might look cool but I'm not sure now, maybe I'll go over them with some green:
edit: and here's a shot of the damaged side. You can see on this cheek that I haven't yet done the green: it's just based in green and with a few layers of brown and purple. Still a lot to do. I'm also trying to figure out how to do the damaged eyeball... with no lightbulb moments so far.
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And then the lady hasn't changed much, just an armature and sizing her body. Arch, those links you sent were really useful for this bit so thanks for them!