OK I dunno if this will be taken nice or not but here it goes.
What I would do for starters is put your name on the barrell of the gun.
Put the C4D in the bg as black and white so it matchs your focal and don't draw the eyes away from your focal.
Since you went with a white bg maybe use a feather brush and erase the edges slightly so your C4D just don't cut odd at the edge of your sig.
Other then that keep at it and look at some tuts