iPad and SketchBook Pro

There's an app in the iTunes app store called SketchBook Pro.  It's wicked fun to sit on the couch and just doodle away the afternoon.  You get all sorts of brushes, which can be manipulated, and a full color editor.  Here's a clown.  Why a clown?  No idea.  None whatsoever.  This one is three layers: The background (different shades of purple with different opacities), the shadow (an airbrush with high opacity), and then the clown (color and outline).