Generally, ears stretch from the eyes to below the nose. Use the horizontal line you first drew for the eyes to line up the top of the ears. They will end between the bottom of the nose and the mouth. Draw the ears. Remind them to draw ears as seen from the front.
Eyebrows tell a lot about a person's mood.
A gentle arch over the eyes should do for a relaxed face. They stretch over the whole eye or more. They are wider in the middle of the face and get thinner. Most people draw the neck too thin. Start at the ears and gently curve in then out again.