I really enjoyed this shot. (I'm a sucker for NYC)
Lets start with the exposure, I think you could have gotten away with a darker image. The sky could have been a little darker, this would have helped the noise and "washed out" feel (you might want to try some selective burning going up towards the purple at the top of the ESB). i like the person at the bottom of the frame, but also think it would have worked better had more of the person was visible. I also think some burning would have been appropriate on the building on the right hand side of the frame. The glossy shine of the street is great, and the overal composition is good, I would recommend going out and experimenting with some different exposures (longer, shorter, ect) and you will produce some more terrific shots!
oh, pretty, i've never seen it purple before. the shot appears a bit too busy for my own personal taste, though i acknowledge how difficult it is to take a shot of a tall building with a skyline dominated by other tall buildings... getting a bit closer might have made it a bit more dominant in the shot (i think from madison square gardens there is a good view to be had). i love how the haze is illuminated also, though. 5.