Basic Drawing Made Amazingly Easy (Made Amazingly Easy Series)

Individuals exhibit subtle differences in their own head and body
proportions, which make them unique—and interesting. One person
may have smallish eyes. Another may have a particularly wide
smile. So the “takeaway” is this: Familiarize yourself with guidelines,
and follow them in general, but feel free to make adjustments and to
experiment in order to arrive at more individualized personalities.