Shape characteristics of male and female heads. The male's head is large and tends to be square, his forehead is backward, his brow arch and nasal bone are prominent, his jaw and forehead are square and his pillow is prominent. From the appearance, the male head lines tend to be rigid and straight, and the body fluctuates greatly.

Women's heads are smaller, and the protrusions and nodules on their faces are not as prominent as those of men, but the frontal and cranial colliculus are more prominent. The forehead is straight, the chin is pointed and the face is round. From the appearance, women's head lines tend to be soft, and their bodies fluctuate less.