I should use this avatar a lot more, it gives me a lot more confidence in how much of an idiot I'll allow myself to be. I mean you see my derpy mouth and you know I ain't a serious dude.
Anyway, on topic... um let's see.
Oh! Here we are, a common practice for a mediocre artist like myself whilst making expressions is to reference how I make faces, and then use that knowledge in a cartoonish application, including hand jestures, eyebrow arcing and ear movement... it all counts!
Now granted, you have to exaggerate it a lot more for a cartoon, (it's a law or something) but you can see how it translates from one medium to another.
And one more of my wonderful crossdressing.
Ooh! I'm so sasseh!