i like it very much, but you could have detailed the gun a bit more...
i like the texture of his jacket and your use of values.
lemuren......Quite nice! It's got a lot going for it as a drawing. You have some good blacks in the shadow areas but limited value in the mid range. A smudge stick can get you that mid tone range quite fast and add to the overall depth of the image. Don't pass up the opportunity to draw elements that could only add interest to the finished piece, like the gun and the building. Both weapons and the environment tend to help set the time and place of a drawing like this and fans of this genre really demand such details. Lets see some more!
Looks really tight to me. Some excellent rendering skills you display here. I like the perspective on the wall behind him.
One crit: I think the image would read better if we could see his whole gun and maybe a bit of the stone behind it.