Proportions are all fucked up.
I know that people are pretty impressed simply because of the stylization of the artwork, the gradient shading and all that. But I certainly am not.
Her right arm is long enough for her hand to reach her knees. I don't mean in the position she's in, I mean even if she stood up her hand could reach her knees without having to bend her body to do so while her left arm, the arm that should seem bigger by comparison because it's closer to the viewer, is perfectly proportionate with her body.
Her hips are weird, they gouge out as if you drew her upper body separate from her lower body and then pasted them together; they bend at two different angles. If you remove her upper body from her lower body, the uncompleted artwork of her lower body would imply that the rest of the character is supposed to be leaning forward, not back. Apparently her ilium/pubis can mirror the position of the rib cage.