For example, according to the shape and direction of eyebrows, it is consistent with the shape and direction of eyebrow arch; The size and protrusion of eyeball are related to orbital morphology; The shape of nose is related to nasal bone, pear-shaped hole and anterior nasal spine; The size, arrangement and occlusal relationship of teeth and the shape of upper and lower alveolar processes determine the size of mouth and the relative position of upper and lower lips. The shape of the ear is related to the shape of the external auditory canal, mastoid process and mandibular branch.