I love everything about this picture, apart from the jacket below her breasts. It just sits wrong, can you run dForce on it to give it some hanging weight? And maybe change her mouth expression? At the moment, you can't tell if she's happy and smirking or sad and rueful. It's the only indication of emotion in the scene and (at least for me) I think it needs to be sending a more powerful message.
But it's a great render, the lighting and DOF really work to bring focus to the character.