I agree with much of what Goatee says:
1) I also would crop. Though I don't mind the background (the lines), I would crop out all of the door jamb above, and all of the white part of the door by his left elbow. Since he is looking into frame, the fact that he will be off center is NP.
2) At first I did not like the shadow, but now I really do. I agree that it could have stood less exposure, but you can't unring the bell. If it were mine, I would crop a little bit, increase contrast (You have half-way there now, might as well go over the top) but don't let the shadow get lost. Consider monochrome as well.
3) & 4) both work for me as is.
On a personal note, I just want to say thanks for the laugh! I cracked up when I first saw these shots!
I had that same mohawk starting in 1979! Most every Friday or Saturday night found me in Hollywood seeing DK, X, Black Flag, Siouxie (before and with the Banshees), the Adolescents, and so on and so on. Oh wait, even saw The Clash once too!
I think it is amazing that the same stuff that was oh so hip slick and cool back then is still around. And what, this is 27 years later! Can't kids these days find a style of your own!
Rad