Especially with larger photo sets, a single image can hardly give an impression of the different contents. Therefore, it would be brilliant if several images could be shown as a preview for photo sets. It might be possible to adopt the current preview style of videos. I'm thinking of a small slideshow in which several images from the set are shown. Both in the overview and on the corresponding page (e.g. slider). Yet it would be important that the images can also be selected manually. Another option would be an enlarged view of selected images. So a tile view of three to five images from a set. But I think that the first option might be more in line with the general design of your template.