Perhaps put some more detail on the "box" that is the base piece of your chaingun. Now, it's just a cube, and you should also remove the bullets from the spent ammo.
(What do you call the brass cylinder that contains the gunpowder, and is left when firing a weapon?? The english word...)

The fur is really neat. Perhaps some more fur density or scraggle could give it more a fuzzy look, and not the spiky look it has now?
Looks like touching it could really give you a sting, but perhaps that is the idea

Otherwise.. It looks really cool... The ice on the stones behind him gives it just that little touch of detail and depth.