Well, the whole image looks pretty evenly lit. I'm not seeing a lot of shadwos, etc. The only shadows I am seeing seem to be coming from a light source located mostly straight above. If that's what you are going for, then great! ; ) If you want a little more mood, you can try varying the lgihtsing. Create multiple light sources, add a little color to some of them, a touch of red would be nice on an image like that.