The text is hard to see on all of them. And they all need borders.
For the Kratos one, I think he should be opaque, to the left of the sig, and the text to the right (since that's the direction he's facing.
For the... next one (can't read the text), the stock's blurriness doesn't really work out, and the background doesn't match.
For the Halo Wars, it's hard to make out the Spartan, and the background is too bright and doesn't match.
For the Drizzle one, the background is too bright, making the stock hard to see.
For the Dark Saw, that's good. Dunno what's on the bottom right tho.