What is the first thing to see when appreciating photographic works?

To appreciate a photographic work, we must first look at its theme. Because the author will always have creative passion when he has deep feelings, a work will always reflect the author's likes and dislikes. The objective effect of a work mainly depends on the author's cognitive level and artistic level. A good photographic work should strongly infect the viewer, let him feel what the author wants to express and let him sing.