Number 1 I feel has too much shadow / dark areas, and the guy picking his nose in the background is a real put off. The silver frame is distracting too, in short, less shadows and a better background would be good.
Number 2, there are very bright areas on the various backs, and I the guy not looking, whilst in such a prominent position is a shame. Its a busy scene.
Number 3 is actually good, although the flowers on the edge of the frame are a slight distraction, and I personally would have tried to keep those lovely windows in but, I also would have tried to loose the pipe and bench.
4 is a tad too dark, and the green thingy distracts IMO.
5, I like, but the feet are missing and the reflection bugs me. Guessing hard to avoid the 2nd crit.
6 I like, a tad over exposed?
Well done, looks like you guys had fun.
Gary.