I like the concepts, but notice a few details for you to fiddle with. ^^ Her hip sticks out a bit much, unless you were going for the pear look then you got it. I'd go ahead and define lines around her groin a little more (more overlapping). Her left leg (the left one as we see it), is twisted oddly; I'd ask a friend to mimic that pose AND to keep their balance (I don't think the knee bends that way), and note where their feet are on the floor (different depths, particularly since they're standing against one another, she'll be a little more forward then he is). I think some may comment on her face because you've put the inner part of her eyebrow under the ending of the bridge of her nose. Added with the angle of her brows in general, it makes her glower, when the rest of her face isn't upset, so it off-balances her body language.
Anyway, this is me just pointing out what I see. I personally enjoy constructive criticism/suggestions, but a lot of people take offense to that, so I hope you (and your faithful reviewers) don't see it as me being offensive. Overall, I really like your style, and your skill. I certainly can't draw something like that (yet, need practice), and it's easier to observe another's work than one's own (blind to own editing mistakes, and why editors exist, lol). A very good picture, and I hope that your project goes very well. ^^