Yeah, but a barely mismatched shadow compared to the scene is going to be a lot less noticable than one that is mismatched to the girl's lighting. If I match her (and since I can't change her lighting without some effort), and it looks right, then the scene will look better than if I match the scene, and don't change her. To match the scene, her shadow needs to be a little shorter, and the top a bit further down than the bottom.