You have all the right ideas for sure but its all just a little too restrained.
Go bigger with all your poses and build more arcs into the inbetweens. Remember, animation is a caricature of life, not a duplication of it. So, before you animate, draw-out countless thumbnails of your intended poses, getting bigger and bigger (in gesture) with each one.
Did you use reference? If so, draw and caricature the key poses from analyzing it and then work with the bigger and better thumbs in in your CG environment.
Good attempt though - just a little too 'safe'. :)