My Art 2 Class did the Magritte Eyes. I had them come up with 5 ideas, then pick 2 of the 5 to complete in full color. After that they all voted on each others with tally marks for 1 of the final 2. Finally they got to complete the eye voted on by the class. I talked about illustrators doing their best, trying to apply for a job... art directors sometimes choosing the idea you don't like... etc. It was a process of elimination. Quick and easy.