Well, I'm probably the last person who should be commenting on your photo since I have never taken a night time photo. But there you are under "comment request" so I'll do my best. I don't write "nice shot" critiques; so you'll have to wade through the verbiage to make any sense of this.
I'll give you credit for taking this photo. If I lived in a big city, maybe I'd give it a try. Out here in the sticks, I'm not sure what I would shoot. I like the reflection at the bottom of the shot. To me the shot looks a little out of focus. Maybe that's because the shutter is open for awhile. Also the sky looks funky as if it's been added. The reason I say that is because there's a lighter outline around where the sky meets the buildings that doesn't look quite right.
To me it's a very nice early evening shot. Going by the reflection I'd say the sky looks natural. I can see how it would be easy to get it to dark, but I believe its a good image.