Of course, this is all pure conjecture on my part, but until Bioware shows us some female and/or nude turians, I'll just have to use my imagination, and this is what it's telling me.

Yes, I'm borrowing Nihlus's markings for the male, and the female's markings are modeled after the groundskeeper in the Darkstar Lounge in the Citadel in Mass Effect 2.