Wow... Did you follow a tut? If not, could you make one? That is one of the sig styles I've been trying to learn because I think it's so awesome.
Good lighting, blending, and flow. The text placement and effects seem appropriate (they don't ruin anything, in fact they add to the sig). C4d's add flow. My only complaint would be that the very edges of the sig seem too plain, but I can't think of a way to add to it without ruining the flow of the sig. Maybe you could darken them a little more to add more depth and draw the eye to the focal more while hopefully making them look less plain.