I can't tell what is happening with her breasts. I think you're trying to give the impression that one is falling on the other but they're both facing outward. And I have no idea where her ribcage is suppose to be, A good exercise for you to do would be the following. Identify where her ribcage is, identify where her hip bone is, identify where her shoulders and colar bone are, identify the curvature of her spine.
If you can't it's wrong, it doesn't make sense with a real skeleton it's wrong.
practice, practice, practice!