Almost everything we have seen, especially what refers to measurements, is good to know in the same way that it is convenient to have knowledge of conic perspective to draw a landscape.

But the most common is not to draw a face either from the front or from the side.

To represent-interpret a face in any view, it is necessary to face it with the same attitude that we can have in front of the drawing of a lettuce (angles, auxiliary lines, relation of shapes-pieces, hollows, contrast, light and shadow).

We've been there and back. Everything is the same.

fundamental BOOK

"LEARNING TO DRAW WITH THE RIGHT SIDE OF THE BRAIN".

Betty Edwards