Drawing the Head: Basic Construction

I start with an oval and then put a centre line horizontally (this is the "eye-line") and vertically (the nose runs down this line)

You should be able to fit 5 "eye widths" across the head. The top of the ears is in line with the eyes. The bottom of the ears is in line with the mouth.

You can then build this construction into an actual sketch of the head by adding more detail. Below is an example done with brush and black ink.