Nice stuff! I really like it, the anatomy is great, and the lineart is jagged and rough, portraying a harder personality of your character, which is further emphasised by the accessories you've given him, hair style and pose etc. The silhouette behind him contrasts this by being smoother and more refined, showing another side to our character hidden from view, shrouding him in mystery and making me wonder who he is. A really effective drawing, more please :D
For some criticism here, I would say, don't be afraid to mix in some softer edges into your piece, as certain body parts don't benefit from jagged edges, such as elbows and knuckles. With your outlining and shading, they do already appear nice, so it's a minor thing at most.
I can't critique any more than that really. But that's a really nice piece of art, and I'd love seeing more in a gallery :)
