The distance from a line thru the eyes of a man to his lips is one and a half times the distance between his eyes. For a woman the two distances are equal (also for babies). Just use Transform.
The mask in question is known as the Marquardt Mask, after the plastic surgeon who developed it. You can learn more about "beauty analysis" by going to Dr. Marquardt's web site:
…or by Googling marquardt mask, of course.
Here's an exercise in which the face of the model on the left-hand side (from the viewer's perspective) was transformed into the face in the center by judicious application of the Marquardt Mask, and finally the same image as in the center with the outline of the mask superimposed:
The end result looks like a different person.