A few issues, but not bad..
Generally, it's not horrible, but there are a few issues.
I'll start with the positives. The lines on the face are nice, and not always easy to do..The expression is pretty good too. Is it just me, or are his arms slightly curving in? Jesus, jacking off? :P
The main problems are those regarding anatomy. The shoulder on the left is longer than the right, his beard isn't in the middle of his chin (maybe he's just a bad shaver), his hairline seems off, and his eyes are too far up his head. Just small things, but they make a difference.
I think you could go heavier with the shading too, it's a bit light at the moment. In terms of shading, you should always try to get a good balance, not too little, not too much. However, if you can't find that middleground, more is usually slightly better..
Finally, the smoke from his joint should really be going higher up, unless there's some magic smoke that suddenly disintegrates once it reached a certain height :P
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