Images and captions label what time, event, and place the image is representing. It also gives us a clear representation of its purpose, what it is, and who made it. It's a clear image either drawn or taken a photo of. Take the Mona Lisa for example. It's just an image of a Venetian woman at first, but with more explaining and captions labeling its creator, origin, and the person in the portrait itself, the actual meaning is known.
Providing main information. Picture identification can also be seen in some passages and stories. With the help of images, you can understand the overall concept of that particular paragraph or story. Though it is hard to understand the overall concept of a story with the help of images, you can practice and easily find out what the pictures actually mean. Pictures come useful in many things. So, I reccomend that you should study identifying of pictures.
You can tell because the passage states the thoughts/feelings of multiple characters, while not using "I" or "You" or any other first or second person pronouns.
