I played with the colours a bit, and it's a little more orange. I had this originally but I felt it was a little too orangey. I also made it a little darker overall. The cropping idea was a no go, because of the light source at the bottom left of the sig. It was cut in half when cropped, which looked awful imo. As for the lighting in general, this:
http://www.renders-graphiqu...atsu.png was the original render, and, as you can see, the light sources come from all around.
Anyway, this is the sig with your suggestions.