i like the third and the fourth ones best, nice compositions and the BW really works for them! in the second the people's heads are bit cut off and that makes your eye wander aimlessly for a while...that girl's head should have been in focus instead of the guy next to the screen IMHO but that's a minor detail...good work!
The third pict, i havent got much time to compose. I was near to the man but there were too many people buzzing around. i was afraid that someone might bum into me when i press the shutter open. it was taken at night.