Self-esteem is a concept that is formed throughout life. Self-esteem is about the impression a person has about himself, created through feelings, emotions, experiences, etc.
Self-esteem is made up of different elements, and how we perceive ourselves physically (self-image) is just one of these components.
On the one hand, we have a self-image. Self-image, as its name suggests, is the way we see ourselves.
If, when I look in the mirror, I see myself as pretty and attractive, it means that this is the image I perceive of myself.
On the other hand, we find the self-concept. In this case, it is about how we perceive ourselves at the concept level. If you are a person with positive self-talk, who values his achievements, who is careful with how he treats himself, etc., you have a good self-concept of yourself.