When you’re an illustrator, an animator, or any other kind of artist, the best thing you can do is draw everything all the time. No, really, draw everything you can, as much as you can.

John K. the animation mastermind best known for Ren & Stimpy draws amazing caricatures from tabloids.

You can check them out at his blog.

This particular set inspired me:

http://johnkstuff.blogspot.com/2010/08/beautiful-people-27.html

He also offers fantastic tutorials and advice for the budding animator.