What should be the criteria for judging photographic works?

Photographic works belong to the category of artistic creation, and the judging standard is the measurement and choice of artistic expression. Consideration and evaluation of the expressive ability, expressive ways and expressive skills of works. Every work has a "theme" that the author wants to express. However, different authors have different expressions (or means) because of their different experiences, life backgrounds, aesthetic perspectives and perceptions of the theme.