Spawn

not sure about depth..

http://i150.photobucket.com/albums/s.../spawncopy.png

yea, not feeling any depth in this one.
There also doesn't seem to be anything going on on the right half of the sig (i guess other than the cape, it's hard to tell, it's kinda dark on this monitor).

How did you intend the lighting?
It looks like you have it coming from in front?
You may want to try and contrast the render some or highlight some points on it to try and add some depth.

Looks decent though.

I like it only thing i can really say is the render seems slighty low quality and it takes up too much of the sig with the cape i think anyway like the text though nice work. And i'm with studhorse about the depth.