I must say I agrea with Pit. A suggestion: You could lower the key and fill light till you get just a soft burned light on the model (witch is the style your looking for) and for the volume or detail adding create a back light that creates a contour over the oposite side of the key light direction. Toy story would be a good example for this. The allwas have this highlight.
I love your image tho. I just think this could add alot. Just a small burn would create the same effect. The thing is lighting is composed of ligh, penumbra and shadows. Now you have intense light, light and penumbra, follow me?



