best practices for dealing with a large number of images in a web app

So the user clicks an image and it opens in a new page with description etc. Im only dealing with 12 images so its not a big deal, but what if I had 500 or 1000+ images? Thats a alot of extra pages to deal with. This is part of my final exam and Im curious about best practice solutions for a large number of images under these specific circumstances. And this is being done with asp.net if that makes any difference.

The application should still function like the midterm that if one clicks on the small image clip a new page should be opened with a larger image displayed along with a full description. Please remember to include coffee information such as calories, and nutritional facts. Let’s have a limit of at least 4 pastries, 4 teas, and 4 coffees.