The key word is DOODLE or Die, not "Tasteful, Impressionist Piece or Die".

Uncle Phil gives some advice to Will

Jerry Sandusky the Butterfly

a complex math equation involving aliens, lasers, and possibly the illuminati?

a green face

Le Quack the Duck

It took me a minute before I realized that it wasn't real

A rainbow made of only red and yellow stripes (Other colors available as DLC).

A lazy doodler

A volcano atop a cliff, overlooking a lake. Both guacamole and salsa spew forth from the volcano.

Gabe uses the portal

Tangela