2. Small eyes: The eyes of the pie face are often relatively small, which is in contrast to the width of the face, making the whole face look flatter.
3. Low nose: The nose of the pie face is often low and not three-dimensional, which is one of the reasons for the lack of three-dimensional sense of the face.
4. Concentration of five senses: Because the face of the pie face is relatively flat, the five senses are often concentrated, giving people a compact feeling.
5. The side is flat and straight: from the side, the outline of the pie face is often straight, lacking the beauty of curve.
6. Lack of three-dimensional sense: The most obvious feature of the pie face is the lack of three-dimensional sense, and the whole face looks flat without layering.