Hey, I just got the same camera last week! Really love it and it's my first DSLR.
I really like the composition as well. I think you are going to get different opinions based off of taste. Personally, I like lots of darker tones and detail. So, for pic 2 and 3, I would have taken the exposure time down some. You might lose some detail on the pillars and the surrounding building, but it's dark already and you know what those parts of the building are. You are losing a lot of detail on the lit portion of the building, which would be nice to see. But, I don't think you can get that detail back once you've exposed too much.
Overall very nice shots. Love the street shots as well.