kick ass work. i love the old-school feeling it have almost like an iron maiden cover or maybe old megadeth.
i know its finished but the only comment i could say is on the barrel.it look a bit too "tubish" , i mean if i remember barrel usually have some kind of rim along it.
Plus it would break the straight feeling of it.
The composition would really sing if the foreground zombies were at some point actually overlapping the King and his waste. Right now they're sort of disconnected. It's also got this sliding sideways feel because your figures are gradually going down in height, and farther back in space from right to left. It really makes me want to see a zombie taller, or closer to the viewer on that left side so that the King is nicely framed.
That said, love the retro colors and the waste-zombies. That yellow really pops out!