I find that one of the hardest things when making a skin, making one that's almost completely black look good.
I've made skins of anime characters that I didn't know for people many times, I know how hard they can be to improvise when you haven't really a clue who the character is. I looked up a reference and I think you did quite an awesome job on recreating his look.
If this is a 1.8 skin, I guess you could've been more creative with the 3D layer, like making the gloves, belt or bottom of the coat stick out. ^^
Other than that, I would've personally put the belt up a bit higher, as a part of the body instead of the legs, but that's just personal taste
Over all, nice job :3
Here's another one of mine, a newer one this time. A girl in a dino costume, this is a pre-1.8 skin.
Who's next? :3