Buddha, entertain me if you will, but in terms of our perception and communicative body language, let's say we are more sensitive to the face from mid forehead, where our eyebrows and forehead communicate to the chin... not so much the head as a whole:
Taking only the face into account, the eye and mouth idea it's not too far off the rule of thirds, as in this example:
Yes there is math involved, but humans have developed such a subconscious ability to read even the most subtle of facial expressions, there must be some connection between artistic perception and this highly advanced visual acuity.