Omg, looks fantastic! lol, but hmmm…something’s a little strange here, I think it would look better if he was standing on the very edge of the roof, possibly on the corner of one of the 4 sides of the building, and would be turned away from the building in his perspective. Then just show a small portion of the building he is on, e.g. - show buildings behind him, maybe a small section leading to the roof e.g. - small box w/ door & maybe a small light right above it, this would be a little far back if he is on the edge though. You could also have a little heater or w/e they have on buildings, with steam coming out of it, which would make the scene look more active. Then you could show buildings further back behind that building (of course he’d be facing the camera). However you do it, I’m sure it’ll look fine :D.
Nice update 