[waterhouse]

I wouldn't even call it white skin, actually. It's not really a flesh color; breaking out the Digital Color Meter, it's slightly warmer than a grey.

Then there's the way light reflects off of it, some of it looking rough or dirty in a way skin usually doesn't, with some parts brightly lit as if by one very bright source. (I think glare explains some of it.) The breasts themselves often look brighter, and sometimes cleaner, than everything else; occasionally they do match the surrounding skin, which naively looks a lot better until I realize I have to abstract out the lighting.

Even if you can't vary the skin tones, I think that using more uniform lighting would help. And maybe something dumb like spraypainting the main body a mono-color would work, although that might make it more complex to show scars.