if you will to try it I'd suggest explicitly setting "ambient 0" in one 
texture at a time and rendering.  That way you'll see the effect 
progressively and get a real good feel for the effect it has.

Definitely give an area light a go, they make a real difference.  I usually 
build the model with a standard point light and put in an area light when 
I'm close to the final render.  The Area Light makes the scene!

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