Well, excluding the fact that I am a huge Johnny Depp fan (so I was immediately impressed) I love this drawing! The shading breathes life into the drawing. Your technique brings the image to the front and resembles a camera photograph. The details are spot on. There are a couple of places on the folding of the clothes that fall flat but still very realistic looking. The likeness is incredible. There's no confusion on who the subject is. The only thing that may need a touch of detail, is the ear. Every feature has a life like quality except the ear. It just seems to be there rather than connected. Maybe a little shading to add a canal so that it flows with the other features.