If you think your boss/client/internal critic is tough, you haven't read Tiny Art Director, a collaboration between artist Bill Zeman and his four-year-old daughter. Here's how it works: Tiny Art Director commissions a piece, Bill produces a sketch, and TAD craps all over it - in the name of art, of course.
The Brief: Crocodiles
Preliminary Sketch (no longer extant): Upon seeing the preliminary sketch, the art director, in a rather unprofessional outburst, collapsed on the floor sobbing and screaming.
The Critique: The back is so so so bad I don't even want to look at it! You always do that to the crocodile's back!
Job Status: Rejected and Destroyed
Finished Version (above):
The Critique: Good. The big one is me. You can be the little one.
Job Status: Approved
Via Automatism, the source of all good things.