So you want to be an artist? New York Magazine critic Jerry Saltz has 33 rules — plus some exercises. Here’s one: Copy a famous work in any medium. Make it as exact an imitation as you can. This will help you learn another artist’s voice. When he posted this assignment on Instagram, hundreds of his artist followers sent in their delightfully derivative works. Here are a few of our favorites, from a textile take on The Starry Night to a digitally rendered A Bigger Splash.