half the distance between the eyes and the chin. I draw a dot there. The side of the nostrils will be located under the inner side the eyes. I place dots at these places as well.
Now it is time to move down to the mouth. The mouth is located halfway between the tip of the nose and the chin. The side of the mouth are located just under the pupils of the eyes.
Once I placed these essential points, I can start drawing my portrait. Try it. It's not hard and you will be surprised with the result!