Of course, there are more positions of the head possible than profile, frontal or three-quarter. Light construction lines are also useful here, because before you know it, you draw the position incorrectly at first and then you keep wondering why it just won’t work. In the study of an old man, we see his face not only turned a little but also a little from below.
Exercise 1: Draw a head slanted to the left and slanted to the right. Use the construction lines.
The head tilted.
Exercise 2: Draw a head that is bent backwards and a head that is bent forwards. Show how the construction lines bend/turn with the head. When you draw a head from below, the upper half becomes much smaller and you can clearly see the nostrils for example. When you draw a head from above, the lower half becomes smaller.
You can study many more positions in this way, together with the neck and the transition to the body. It is useful to start with a circle (actually a sphere), the jawline and the flatter side of the skull. Assisting lines for the height of the eyebrows and eyes and the vertical axis of the face are essential in this example.
EXTRA 1: If you draw kind of a a globe, you can try out funny faces in all kinds of positions.