Nice! That's pretty cool! Really, I think the only major issue I see is with her right arm. I believe the upper arm is slightly too short, and that the wrist and hand could be bigger. Also, I'm not totally sure, but the elbow area doesn't look quite right, but that's also an are I struggle with.
That's the changes I would do. Just making her right arm longer, lower the breasts a bit since there's more space now and make the wrist and hand going away from us bigger.
Beyond that I dig where this is going. I love the face and her expression. The pose itself is cool and the hair flow nicely. I don't know how far you're planning to go with this, but it could make a very nice illustration