Full disclosure: I've only seen 1 or 2 episdodes so far, but I definitely see its appeal. I'm trying to catch up on my Rust Belt Monster challenges and put together a quick drawing for Adventure Time. Drawn completely in Sketchbook Pro with a little touch up in Photoshop. I played around with the S-Curve tool to try and keep the characters organic. Normally I draw my characters more blocky and I'm trying to get around that a little bit.