Great job on the figure and the elements of motion. But I'll have to agree with Smeagolthevile alittle on the waist, it does look alittle thin. But, I rekon that's a matter of personal taste. Otherwise a really great job!!!
Well, not really. It's a bit more objective than that: she needs room for her ribcage and internal organs. In the profile view it looks like most of the horizontal space would be taken up by her spine, especially with the deep trough in her back. It reminds me of a Rob Liefeld drawing.
The arms and lower legs seem much too thin to me, too. Even the bent leg has almost no apparent calf. Right hand looks too long and fingers need refined a little. The hips and crotch seem a bit too wideset. I think the left boot could be more upcurved, too.
But in general the musculature seems complete and informed, even if the proportions are off in places, as far as I know. I think the face is good, though the eyes a bit catlike. Most of the finish is well done. I like the subtle blending and definition in flesh and cloth; although I think the right upper arm might need looked at, and the wrinkles in the shorts and the side of the top maybe smoothed out. At least at the ends.