While we normally critique the waist, there doesn't seem to be any sign of the hips either.
As in, it goes straight from the pencil waist to the thighs, like on a really poorly made doll.
Once more, I'm still struggling with anatomy when it comes to drawing, but I've come to understand the basics of it, and that is the thinner the person is the more the body's lines contour to their bones, and she is missing her pelvic bone.