Okay I like this sig.
But i dont think its at its fullest potential So ima say what "I" would do.

I would strike the border and do a solid black 3 or 4 px all the way round.
Make ONLY the gun come out of the sig. Because Its hard to tell what it is IMO.
Then add a few C4Ds or some more efx.

I would possibly say a black and grey gradient overlay then a color balance.

After that IMO The text isnt working there because "light text" in "the light" = Hard to see.
So i would move it to the shadow side

I would strike the border and do a solid black 3 or 4 px all the way round. Exept for at the gun if you make it stick out.

Nice lighting. I think this sig is pretty good mako
Those are just somee suggestions :P
If im crazy and those ideas wont work someone please tell me now haha