noun
A person's mental picture or perception of themselves, often used in psychological or self-help contexts.
ポジティブなセルフイメージを持つことが大切だ。
It's important to have a positive self-image.
Synonymous, but セルフイメージ is the more common katakana loanword; 自己イメージ uses the native prefix 自己 (self) and may sound slightly more formal or technical.
Borrowed from English 'self-image'.