How can I highlight the theme I want to express when taking pictures?

A good photo should have a distinct theme (sometimes called a theme). Or show a person, or show a thing, or even show a story of the theme. The theme must be clear and definite, so that any audience can see it at a glance.

2.

A good photo must attract people's attention to the subject, in other words, let the viewer's eyes turn to the subject immediately.

3.

A good photo must have a simple picture, including only those contents that are conducive to attracting the subject's attention, and excluding or compressing those contents that may distract attention.

As long as you start to think according to these three basic principles, you will find that your life as a photographer begins to change. You will look at a beautiful photo with a new standard. More importantly, you will observe the world in a new way and capture the picture in a new way. You will start to see the world through the viewfinder with the photographer's eyes!