A few adjustments needed.
I'll start reviewing by saying the good parts of it...
1. The jokes are good.
2. You're good at erasing the space around sprites.
3. The background matches the sprites choices.
Now for things you need to improve on...
1. I guess you've never heard of the trace bitmap command.
2. To animate the punch better, use MS Paint.
3. (optional) use different sprites.