You've captured some good moments but the frames are far too wide and the composition is completely off in the fourth one. Literally 75% of the frame is useless (a room full of bored people barely watching), and the subject is out of focus anyway.
As KIPAX says the over the ring approach doesn't work, it's the same issue that plagues 99% of amateur photographers at sports events, get low, look up at your subject make them larger than life, not people to look down at.
Also a few of these need straightening, and cropping tighter. No one cares about a boxers' legs, get in close, all the action is from the waist up.