Charismatic artist at makeup

One of my friends, she works for a cosmetics company. Everyday she makes customers up for selling. The other day, I met her and she made my face up. It turned me into different person.
I am interested in makingup. But Usually very simple. Rather than it's simple , I don't have good skill for makeup. So she is a good teacher for me and "Charismatic artist".
However, according to her, she gets into trouble with making customer up.
For example, a customer is sitting in front of her but she doesn't have any idea for making up and she thinks "how to make her beautiful? Some of them are not beautiful and not attractive.
I thought it is her job but sometimes, her work is at at standstill.
When a famous make up artist came to her shop from France, he guessed Japanese don't understand French so he talked asperities to himself " but unfortunately, she can speak French and irritated her. What a bad situation !! and he seemed to be fired.
Making other people beutiful is so hard. The problem is whether it's nice or not for them.