This is one good way to get students thinking about the head in perspective and how the features wrap around the head. It's a good intro to drawing the head in a variety of positions.
It's pretty self-explanatory. I do a demo to start them. The students simply draw these cartoon-like heads looking in as many different directions, from as many different angles, as they can think of.
The way to start is by drawing latitude and longitude lines on the spheres, as if they were globe maps. Often they get stuck at this point and create incongruous relationships of the vertical and horizontal axes. As they draw each head, they follow the lines by adding mouth and eyes, very simply.
These may come out a little exaggerated, and that's okay. The face is relatively small, and unless it fills the page and feels very close up, the perspective is very often not pronounced. But the features do wrap one way or another, and I often have to point out when the students get the features wrapping the wrong way or not enough in these drawings.
