This feature is really handy for designers who want to create notes around designs and mockups to showcase to clients. As a photographer, I can also use this to create a searchable sheet with keywords for my photos. You can even use screenshots instead of Unsplash photos like I'm using here.
Basically, all you have to do is insert the images into cells and use V lookup to search for them using the ID numbers. You can use this to mock up a newsletter, test out different thumbnails as a YouTuber, or create a landing page or workflow for your business. It's really easy to change the photos by just changing the ID number.