Here’s my first attempt:
I started out trying to capture the expressions on my face in the mirror. It sure does not look like me. I know, ultimately I have to go further than just attaching human mouth shapes to cartoon animals. But this is how it came out. Maybe at some point I can get past the “realistic-looking” style and really push the expressions into more cartoony realms without losing the essence.(Click on any of these images to enlarge)
As you might see I'm still not sure whether I should do caricatures for the cartoony versions or whether I should apply the expressions to a completely different character. Right now I've just made up some generic cat character without much emphasis on overall design.