rifleman,
Dave has it correct IMO. The facial references are a RESULT of getting the bones lined up, NOT a target of the draw. IF you arbitrarily select an "anchor point" you are most likely using arm muscles (I believe that that is the only way to "move the anchor back".) If as Dave says, your string arm is relaxed, your hand will land on your face where it will (based on overall bone length) and not at a contrived or selected place.
Arne