1. could have been better composed the box is distracting, would of focused on first guy rather than middle.
2. Too dark, arm is covering face, ruins the photo
3. Best shot but hes very small, could have been taken with a snapshot camera in the crowd. zoom in or pp.
4. Would be the best shot had he been turning towards you, also needs to be zoomed in, too much dead space.
Good luck in the future though.