My comments:
SIG:
His name is very hard to read; it's in an illegible font at an illegible size in an illegible color

YOu need a bolder font, and maybe add a contrasting color stroke.
Boom Headshot. I like the gold/orange color for the text, but not the scribble behind them. First off the scribble is a similar color to the text, making the text blend in and making it... illegible

Secondly, it doesn't add anything to the design. A contrasting stroke or shadow would work much better.
Finally, why is it so
big? It's just a bit too wide horizontally, stretching the board sideways a bit. But it's also so tall that when you actually put it into the sig area, you're only going to see down as far as the Call Of Duty logo... This is an easy fix, just shrink the image down to about 75% of it's size. Shrinking, however, will make the above two "glitches" more prominent
SPRAY:
Using a post on MyFonts WhatTheFont forum, somebody identified the fonts in the Meet The Sniper intro, so I stoled them. (Actually, I used the demo image generator from their websites. Shhhh.) { For reference, "Meet THE" is Compacta SH-Black, and "DUKE of SNIPING" is "Blackoak" }
Lacking the actual image file, I would...
1) Make the black cutout for the Meet THE block larger...
2) ...and semitransparent.
3) And I'd cut out the bottom black bar, as you can barely see any top black bar, it seems unbalanced... to me...
4) And put Boom, Headshot... in a stroked font on top of the rest of the image of the sniper. Actually, Boom, Headshot... should be on the left hand edge...
(Also, note... sprays are usually 256x256 pixels in size... yours is 400x 300

So, more shuffling!

)