It's good. I heard that he thinks the perfect facial curve should be a quadratic parabola, and its formula is y = 1/2x2 (0 ≤ x ≤ 3). At the same time, the side of the standard face, the protruding points of the nose tip, chin and mandibular angle, and the protruding points of chin, ipsilateral mandibular angle and contralateral cheekbone are also on this perfect parabola with a 45-degree angle of view.