The image trending list on nostr.band doesn't necessarily show you the images people were excited about. It often shows you the people people were excited about, but we already knew that.
I don't think you can measure how interesting images are, unless you can somehow judge their appeal separately from the npub that posted them.
On an image-forward platform, like highperfocused ⚡ (npub1fq8…mzut) ist building.