I really love this, one of my favourites I've seen in a while. The colours are particularly lovely, and I really like the chunky outlines. It all seems pretty purposeful to me, looks like hes wearing gloves, and the shading on the head is the same as the gun, I guess 'cos its shiner than his suit.
Id like so see him in a little scene.
The only one crit I can think of is perhaps his left wrist could pull in a little tighter, a bit more like the original lines.