Images act like shortcuts to the brain: we are visual creatures, and we are programmed to react to visuals more than to words. Visual stimuli and emotional response are linked in a simple way and these two together generate what we call memories. Hence, powerful images and visual metaphors create strong impressions and lasting memories in learners.
https://elearningindustry.com/visual-learning-6-reasons-visuals-powerful-aspect-elearning