Every artist learns through imitation, but I rather doubt the aim of these things is artistic development. I assume they're either homages or satiric riffs, and are not intended to be taken too seriously as works in their own right. Otherwise I should be talking to a copyright lawyer.
Bill WattersonWow, it really snowed last night! Isn't it wonderful? Everything familiar has disappeared! The world looks brand new! A new year ... a fresh, clean start! It's like having a big white sheet of paper to draw on! A day full of possibilities! It's a magical world, Hobbes, ol' buddy ... let's go exploring!
Bill Watterson