Thanks for the compliments, an artist is always pleased to know his work is appreciated!
And in answer to your question, nothing more than daily practice. I wasn't very good at drawing until a few years back when my dad picked up a copy of Draw Squad by Mark Kistler, and me and my sister started cartooning. It changed our lives, giving us a positive mental attitude in everything we did. I strongly recommend the book to anyone who's interested in having endless fun.
As for the Alien, he's the last level in Supa Pong.