I can only agree with Freelance ( Isn't it wonderful when someone more eloquent already laid down your thoughts? No? Point. ).
The birthday flash actually made me laugh, although I didn't get the in-jokes. It was just so beautifully random.
And that Snacking Spaz is just soooooooo stylish. And there's some surprisingly good perspective in the Cheetah Poppa picture, too....
Generally speaking, it has really been quite a while, but I immediately saw how you have improved. The characters seem to have more substance and you appear surer of how to draw them. Especially visible in the sketches for the class, if I remember correctly...
Well, and I still have to agree with Freelance. I don't like traditional American cartoons... but I love your style.