NOt too bad, actually. The general alignment of the spine and proportions, for the most part, look pretty decent. My one concern is the hips - they look... just a little weird to me, maybe the shape of them, but this is a fairly rough sketch so I suppose that's to be expected. You're getting a lot better at al this drawing stuff, though. :3

I have to disagree with KitsuneKimmy. The spine is a bit off, in my opinion. If her legs are in that position, the rest of her body has to compensate for it, giving her an S shape. The torso needs to be a bit longer as well, given how long the legs are. The feet seem like we're seeing them from above somehow. Aside from that, I think the drawing is pretty good, it just shows room for improvement.