The head, from any side you take it, is a circle and its form is like in the fig. 1. The distance from the circle to the joint point is almost equal to the radius (of the circle), but I'm not very sure for this. The hair are symmetrical, as it is also all the head, and are made like an arc until the height of the eyes like forming a heart. The eyes begin directly under the end of the hair and their end is near the cheeks. Directly under the eyes are 2 points. The ears' length is almost the same as the length of the eyes, but only that the ears are moved down a bit. The hair (from the sides) are held together with two circles as you can see in the pictures. The mouth can be just 2 short horizontal lines, or a reversed triangle (more or less), or an ellipse. The nose is slightly above the mouth [I hope you find the right place!!:-)]
The eyes are an ellipse + a smaller ellipse (the pupil) which has a circle and two lines on the sides. The pupil has a smaller white ellipse on the above part. Under the eye there is a small arc, while above it there are two big arcs. One of them (the lower) is thicker and has the eyelashes, while the other thinner.
The head, as I have already said, has the same construct. You only need to know where to put the elements. The pictures help for this. The shadow in every position and according to the side of the light is as follows:
It begins in the middle of the chin and goes like an arc until the eye, it continues on the above part of the eye and under the eyebrows. Also it continues under the neck and on the neck's side.
