Look at the photos and see what photography criticism methods are available.

What the landlord means is how to distinguish a good photo from a bad one.

Personally, any photo will have a center (this center is what the photographer wants to express), and everything in the photo serves (sets off) this center. When we are looking at a photo, if it is difficult for you to see what you want to express (Picasso made a job change), this photo may get a low score.

Then light and composition. Of course, this also serves the center, but it can better show the photographer's technical level.

And the most important thing is that this photo can impress you or others.

There is nothing absolute about art, but personal preference, niche and popularization.