The goal is to have large thumbnails that show enough detail so people know from the thumbnail if they want to see a larger image.  The page contains only a matrix of thumbnails.  Then when you click on a thumbnail, the thumbnails disappear and the larger picture appears.  Thre is some navagation controls to be able to move to the next/prev large picture.

This is the behaivor of the Gallery module that comes with DNN.

But your program offers higher quality and signficantly improved admin functions.  So, it would be great to replace the Gallery module with UMG in our sales application.