A long time ago, https://wiki.musicbrainz.org/Flickr_Machine_Tag was created. https://www.flickr.com/search/?w=all&q=musicbrainz%3Aartist&m=tags does have a bunch of images, but I suspect most people have no idea about it - we don't even display that information anywhere, let alone in an easy to copy form and we certainly don't do anything with it.

On Last.fm event pages, they display a section for photos from Flickr with information about which Flickr machine tag to use, e.g. http://www.last.fm/event/294161+Soirée+à+Emporter+%231 (https://www.flickr.com/photos/tags/lastfm%3Aevent%3D294161/interesting/ apparently has some images tagged for that event, although nothing loads on the Last.fm page for me)

We could do something similar, e.g. have an images tab for certain entities (artists and events would definitely make sense, places might be reasonable too) which would display the machine tag people should use and display a gallery of images with that tag.

The main thing I'm not sure about is how we would handle any misuse. Does Flickr have a functioning way to report things like that, or would we need to handle it ourselves?