I teach junior high, when drawing faces I use the thirds but also remind the students that it is actually a head not just the face. I am adding how I teach measurements based on the eye. It works and students are amazed. If you have questions email me. Wanda
Drawing the human head:
The features of the face can be measured by the eye.
The eye is an almond shape open more near the nose slanted on the outside. I demonstrate on the board how to draw eyes, noses, mouths, etc. and hair before we ever start the face.
Once you draw the eye the other parts of the face / head can be draw using the eye and measurements.
I have them draw one eye either left or right of center on the paper, no face/head shape is drawn until we have eyes, nose and mouth on the paper. They then decide if they have drawn a female or male before adding face shape, ears and hair.
Here are the measurements based on teh eye:
The face is five eyes across temple to temple, eyes go in 2nd and 4th space.
The nose length is the distance between the pupils of the eye. Close you eyes and pretend you are touching your pupil with your thumb and index finger, hold that measurement turn and it is the length of your nose.
The nose is an eye length wide at the base.
The distance from the end of the nose to the upper lip is an eye width
The length of the mouth is the same length as the nose
The width of the mouth is the length of an eye turned side ways
The distance from the bottom lip to the chin is the length of an eye turned sideways
The distance from the eyes to the hairline is also the length of the nose or from pupil to pupil
The eyebrow is an eye width above the eye
The distance from the hairline to the top of the head is the same measurement as the forehead
The length of the ear, for drawing, is from the eye to the end of nose
The neck begins at the curve of the face and is the length of half the face
The shoulder measurement is two head lengths sideways