"The space between the parting of the lips [the mouth] and the base of the nose is one-seventh of the face."
Also: "The thickness of the head from the brow to the nape is once and 3/4 that of the neck." I'll try to remember that. #link
Also: "The thickness of the head from the brow to the nape is once and 3/4 that of the neck." I'll try to remember that. #link