Ok, so I smoothed the animation, and I tried my best with the face. I tried a few things with the shape, and did my best with the mouth opening, not sure if I really did much good for it. Everything else I was trying just made it look even goofier.
As for the flapping, it isn't because of standard concusive kickback... rather energy being let loose. So not really like a bunch of force that would push him back, just some 'wind' or 'energy' being the source of the flapping.
As for the flapping, it isn't because of standard concusive kickback... rather energy being let loose. So not really like a bunch of force that would push him back, just some 'wind' or 'energy' being the source of the flapping.