Wow I just looked at all these frames individually and to be honest a lot, if not all of this seems like you have just rotated and repositioned each and every limb
Half if not 80% of these positions don't even seem plausible.
Lets start at the first row of frames, the crouch.
While he crouches his legs are shrinking, and you think this conveys crouching?
Where did his ass go?
Even if it's "supposed" to be behind him it looks like his hips and legs are just compressing it doesn't look like his legs are bending really to be honest.
Now onto the third row, because the second row is inconclusive.
When he lands on his hands what is up with his legs? they are quite deformed and like his knees are together.
His arms all of a sudden snap backwards breaking on impact.
He then flips him self over, and his tube like arms become real apparent here, I don't see a joint I see one tube that you are trying to portray as an arm.
While he rolls, he goes through the floor.
His head goes lower then his feet ever do on the image, so to me that looks weird, especially since it seems like a straight side scrolling view.
I think your problem is your doing all these crazy dynamic animations without really mastering even the simple ones.
And your also becoming too reliant on rotation for all your animating or at least it seems that you have put the sprite into,
the proper positions strictly from rotation and modifying the original sprite.
And the stand up takes up 5 frames?
That's more then it takes for him to crouch and leap that far and fast.