If I can’t find the “why?” I found the “how?”
Add the ears. The base of the ear should be drawn in line with the bottom of the nose and the top of the ear in line with the eyebrows. Remember, ears should be flat against the side of the head.
Sketch lines to define how wide, tall, and the placement of the eyes, nose, mouth and ears.
Use a smaller tipped drawing tool to add the finer details of the face.