People who say that their personalities are written on their face go against scientific research and common sense. The fact of the matter is that there is no way to determine a person's personality based on just their appearance. Some people have hair that is either blond or black and blue eyes. If you knew how to read your fingerprints you could do just that but there is no way to determine a person's fingerprints from just looking at their face. I am sure there are cases where in special doctors can look at a persons face and determine if they have certain diseases or not, but that is as far as science has come in determining the causes of a person's appearance.
If science can't explain why someone's face or behavior is the way it is they can certainly explain why someone has a certain character and that can be helped by watching their behavior. Science may not be able to explain your character, but they can give you an idea of who may be able to help you solve your problems. If you take a person with a certain character and see if they act the way you want them to act and then give them a new personality a new start may be possible.
A very popular book on this subject is "The Man Who Invented Modern Parenting." There is a whole chapter that talks about the effects that parents have on their children. It is very depressing to read because each parent sees his/her child's behavior differently and that causes the children to act different and this is a big problem. Once you figure out what your personality is written on your face you can change your behavior.
Here is an example. Let's say you have a character that always argues with you. Your character acts as if the other parent does not care. You want to give the character more freedom and time. But the child with this personality has never been allowed to do any of the things he/she wants. When the parent gives them freedom and time they act out more and become unruly because they have developed a new personality that involves arguing.
Your personality is written on your face when you are giving orders to people in any situation. If you are doing something wrong and you want people to do it right then you yourself must do it the right way. People will naturally want to obey you. If you don't tell them to do something correctly or with force, then you can bet that it won't happen.
A character could also be mentally ill. When your character is ill, this will show in your face, and it will show in the way that you communicate with others as well. People with a sick character will be difficult to deal with. So, if you need some advice about your personality being written on your face, then you should take a look at the examples below: