I don't see shoulder movement going on where it should, you see, when an arm is brought forwards the shoulder blade will follow and rotate across the rib cage more to the front, and the same is when the arm is brought back.
Now your arms go fairly far to the front, and I think they should go further to the back as well to bring this run cycle into a balance, because like this the change in motion going back forwards feels really abrupt. That could also be due to the timing in your frames though.

The first modification I like, the second is a bit overdone, so you could stick to this because it is indeed looking quite funny =)

The lower arm should definitely change angle with the upper arm, in the jump you need a much much stronger anticipation, you don't jump off your toes, you bend your legs and hunch your back. Any further critique mentioned above by PypeBros & willfauds I completely agree with as well

I like the head, lots, but what comes after lacks alot of volume and definition. I think this could benefit from a secondary lightsource, revealing more of the shape, and what is going on beyond the head..

Give him a few more anticipation frames, showing not just his legs bending, but his entire body preparing for a dodge, and some somersaults. Then at the sand up, make that also more convincing. You can't do a somersault and land perfectly on your legs ,physically impossible, and just looking like a lack of time spent on the perfectionizing on the animation (I'm not saying you did that, because I know you're working hard on this and making alot of edits to DO get it perfect, I'm just saying the current result lacks some time and polishing).