Well, the center of the sig is ok, but a bit crowded. The effect you have around the focal (multiple C4Ds?) is a bit too busy and all-over-the-place. The sides are a bit dark as well... I would lighten them significantly. The blending is not bad, and the lighting is fine. I would change the font... it doesn't really fit the piece. There is also a little red blotch on the bottom left of the sig, possibly a remnant of the C4D/effect, and that should be removed. Overall, an ok signature, it could use a bit of tweaking. Good work.