Needs more movements, choppy, and you probably shouldn't use guns at the beginner's level. I like the humor though, I loled when I saw that thing he threw was a mushroom
but you didn't even add a spark from the gun, and the guy, should have raised his forearm(the last joint) for realism, sorry, but as a beginner, you should start off by learning how to animate simple stuff. Like walking, running, punching, kicking, etc.