They provide necessary visual context to the text, such as photos of people, scenery, or objects directly related to the story.
Here are the key characteristics and elements that make an image "informative":
A "before" and "after" photo pair, or a series of images showing a process.
These can include charts, graphs, diagrams, or infographics that allow readers to quickly identify trends or patterns.
Informative Images | Web Accessibility Initiative (WAI) - W3C