Your sig is a little big, and it looks kinda like you overused the halftone patern filter. Very simple, but the render would look great with a smaller abstract sig.
i like them. they're a little big height wise though. i like using 100 px.
also, with your image, it would look better if you got all of those white pixels out from around it.
if you do not know how to do this, i could tell you how.