The RED PEN OF DEATH comes out every year when we're working on one & two point perspective. I have them fold a 12x18 piece of paper in half so that they will have 4 surfaces to practice.
I also let them know starting out that we're working on an exercise..and that it is not the finished work of art. This takes the pressure off, and they are able to enjoy the process...and the improvement they make during the 4 attempts.
(NO STUDENT WAS EMOTIONALLY SCARRED BY THE RED PEN OF DEATH..REALLY!! THEY LAUGH & HAVE FUN WITH IT!!!)