hahah, I like the mario one. Now someone has to make the mario/zelda game.
I think some of them could be exagerated more. For example the one with the exclamation point could have the pupils shrunk down to dots to make him look more surprised. The smiling one could have the sterotypical n_n sort've look. This isn't anything big because they look really good as is.
The moving eyebrows are entrancing. I think I stared at them for half a minute.