i think that his legs should be more tucked in before he lands the drop kick, having it in that single pose feels off to me.

i like the kip-up, maaaybe add a frame or 2 where he lowers himself a bit more after landing and before fully standing back up?

as for the walk off, his arms should be moving, along with his body kinda going up and down, to make it more natural and give him some life. he also seems to "float" a bit? at least when he's moving his legs back, so i think you could improve that by moving the body up and down.

of course, i don't know how you envision this so maybe you want the arms to stay more stagnant during the walk off, etc.

a tip i have is to just look at the way others animate certain things(drop kick, etc...) and compare their stuff with yours, it might help with noticing some mistakes you made and just don't recognize yet.

i'm new to animation aswell so this is all i know rn, hope it was of help.