This is very nice! I did a quick redline for u since you asked for some critique, if thats ok!

http://www.ezimba.com/work/160529C/ezimba16621552043300.png

I like the concept a lot. One thing I would say is that the torso and hips seem a bit too exaggerated for the style. I would say tone the curvature there down. I would also say that the posing is really nice, and I think you could push it a bit by angling her chest. From my perspective, we should be seeing a little under her breasts, because she looks like she's angled a little above us! And that makes the piece a lot more believable/interesting to me

This is very nice though, please continue to draw, you have a lovely style!