I remember seeing this picture before... did you post it to the forum asking for critique a while ago? Anyway, the shading of this image, especially on the walls, really stands out here. I love the pose, he looks very human and natural, something I don't see often, and can't quite pull off myself. His left eye looks a little too close to his nose, but it could be the angle throwing me off. Overall very nicely drawn and shaded.

It looks like one of those old photograths, don't know if you where going for the faded look but it works really well if you did. it makes the picture more thoughtful which ties in with the look on his face