This exercise was all about learning where to place facial features on the head. I never knew that the eyes were that far down on the head, so I always placed them way too high. Even though I know now that they belong in the middle of the head, I still have to fight the urge to draw them higher! Learning how to use the eye as a unit of measure for placement is one of the most useful drawing tricks I've ever learned. Using it forces me to draw the features where they belong as opposed to where I think they should go, which usually doesn't allow enough space for the forehead and the temples.