Her eyes are skewed to her upper left, her tits are skewed to her upper right, her glasses are awkwardly crooked, you obviously did everything you could to hide her hands and feet, and her torso looks like a trash can.
Even if you're not going for total realism, some small line changes and better proportions can improve this a lot. This is a good example, and there's more out there to be found (taken from
http://www.female-anatomy-for-artist.com/?id=15).