Eheh, i think the perspective ain't too bad (pretty good even) ! I've got mixed feelings about this work
though, because it is so simple, which makes it really good, and overly simple at the same time ^_^'.
You might have added the smoke coming from Onizuka's cigarette. Also, the fact that the character stands out so
much is good, but you could have balanced the wall with another strong visual element (like a group of his students
smoking at the opposite end of the roof).... though unbalanced is also original...
Ahah, yeah i definitely have mixed feelings ;)... but quite an original GTO work, so thumbs up :D