It's quite simple. Just press the Space bar and a random face will appear. I'm working on adding new details like hats.
thanks to my friends who helped me come up with the faces (I used their doodles). this is my 3rd scratch project. if you want to see any new features (bodies, hair, etc.) post it in the comments. Thanks! To see the updated form with bodies, check out my LOL Doodle Maker