This is some top-notch pixel art right here.
I could play a game with this hero all day and still think he looked good. Those are some smooth animations. I think I can see how you did this, and it's brilliant. You should keep this up; this style is beautiful.
I can guarantee you this guy will see some use.
For anyone wondering about ease of use: This sprite is perfect. 64x64, and already centered horizontally with all animations. (SO many people pack their sprites with differently-sized frames, or have them move around the frame.) No extra work is required for this guy.