I tend to agree with 8BitBeard but maybe it can also be a slight bounce at the bttom edge of the shirt to better make the feather read 'real' as it almost has its own flow now. The slightly blocky bounce I like and is quite humurous so maybe don't loose that.
Hah! I really like the color scheme, lighting and general style, very nice.
I can see what you are doing with that animation, but for my taste you've gone too far in snappy-happy land. I'd try adding some more ease out at the end of the jumps and see how it behaves.
very stilish, by the way maybe a bit of gravity would help. He seems too much lightweight as he's skating on the ground.
I also agree with 8BitBeard about the arms/legs movements