I should also check if there are any misconceptions about Mian Xiang that the guide should address. For example, it's not a way to judge others unfairly but a tool for self-awareness and understanding. Emphasize that it's part of a broader holistic system.
I should mention the use of the "five elements" theory (Wood, Fire, Earth, Metal, Water) in analyzing facial features. For instance, a person with a prominent Fire element might have a warm complexion and quick speech. Each element corresponds to different characteristics. Lectura Del Rostro Mian Xiang Monica Koppel.pdf
Also, the balance between the left and right sides of the face is important. If one side is more developed, it might indicate different inclinations. The three major parts of the face could be considered for different stages of life—forehead (early life), middle face (middle age), and lower face (later years). These are common elements in Mian Xiang that I should include. I should also check if there are any