That looks really cool I think! To me it doesn't seem to need any changing, but something that would be fun is maybe shining up a FEW parts of it, kind of like it's given minimal attention, while leaving corners and nooks dull.
Again though, I don't think it NEEDS anything changed about it. Def gives it character. ^^
"It's my mother's gun, it's always loaded."
Aqua (Kingdom Hearts: Birth By Sleep)
Princess Katia- Lost Kingdoms/Rune (making the mock-ups)