I'd define the individual strands of that left girl's right side hair a little more (and call it a secondary light source)
The right girl confuses me.
....
Are they suppose to be nude? I'm confused. And her left boob. Uh...
? Is it really that large?
On second thought, the hair crit may not be valid, since I kinda think it looks cool like that.
Any clothing should not be dithered into the skin. But i'm sure you know that, so I'll assume that they really are nude.