How do you highlight black? (technically, I should know).
Maybe make the lacing and edges somewhat darkish grey?
Maybe add white on some spots to make it look more latexy (even though it's synskin)?
Also, I have like 5 colours (Shadow grey, chaos black, blood red, skull white and mithril silver), so everything is just mixes of those, that's why the skin looks so pale and pinkish, while the pink hair makes it look more pale by removing the pinkness from her face. (And I'm sort of out of cash, still waiting for my payment for a commission, and the buyer hasn't contacted me, or replyed any of my mails/PMs, in 3 months. )