border not aligned (some sides bigger than others) u should fix that, and also, if u do a 1 px stroke in blending options on borders layer, it will look much better
near the middle the white from the bg looks like it overlaps the pic, and whatever the bg is it looks like a regular render clouds or difference clouds.
i agree with the others...i dont like it too much...first of all dont contrast your black background so much with the grunge brush...and yea...make sure it doesnt overlap into your render...im sure ur capable of doing better oh and one other thing...ditch the font...i drn0 i dont like it...hard to read... a bit too tricky and complicated for a simple sig like that one...