Almost all our websites have galleries of popup images.
This is an effective way of presenting lots of images. You can click on any of the small thumbnail images to see a much larger popup. You can then close the popup by clicking in the middle of the popup, or on the close icon, or outside the popup. Or you can go to the previous popup by clicking in the left third of the popup, or to the next popup by clicking in the right third of the popup.
For maximum impact, many if not most of the images should have a short title that helps explain what the image is. That title will also appear as a caption below the popup image.