Nice use of wash for the background, but one thing that bugs me is the lack of hair. It really does take away the sexyness of her.
Somehow, I don't think that was the point of the picture...

I like the bald head. It's an exotic touch, I think.
Next time you do this, try to find a nude as reference. There are a couple places the anatomy could be spruced up, even with her exaggerated proportions. If you don't have one already, invest in a good reference book on muscles. Regarding her posture, I would have turned her left (our right) foot out a little. It's not incorrect being straight on, but it looks less natural.
Watch your tangents. You've got two major ones on her head - check the the bow and the arrows.
That's all for now. I'm very impressed with your work; Keep it up!