First of all, you have to ask yourself why images can exert such an effective power at all. The mere visuality plays a role. Even if words naturally show their effect, pictures have a decisive advantage over them. After all, they work more directly on consciousness. Processing in the process of cognition is no longer necessary for them, unlike writing and language. Instead, images reach you even more directly.
How do images influence you?
Unlike language or writing, both constructed forms of communication, you can perceive images much more directly and intuitively. They can be recognized many times faster by your brain. You capture the basic content of a photo in just 0.1 seconds. Simultaneously, it is easier for you to store a larger quantity of image information. After a few days, it becomes easier to remember pictorial information than, say, a list of words.