Painting the Mona Lisa must have been hard. Leonardo da Vinci had experience, creative confidence, natural talent and awesome art supplies. We don't. Good thing we're not trying to recreate the Mona Lisa.
Piccles is a primitive form of expression and communication. Since the first cave paintings humans made 70,000 years ago, we've been using our fingers to express our feelings, thoughts and ideas.
You might be thinking "But I suck at drawing!" Don't worry, we all do too. Thats why the color pallette is limited, the drawing area is small, and it's anonymous. Expect it to look bad, there's no pressure to be perfect.
It's more fun that way.