Sorry, what I meant was that original content--a page owner's own photos--that's uploaded to places like Facebook, Flickr, Tumblr, etc. is generally being made public through all the rights they foolishly signed away when posting it. I haven't seen rights claimed on Flickr images but I would hope that Flickr makes them clear during a download.
But if it's a screen grab or a scan or some other copy of someone else's copyrighted image, then that's messy, yes. Use your judgement and steer clear of anything that looks worrisome. You can probably find something else that's clearly usable online.
And as others have said, the band should have its visual promo act together. Even if it's a handful of smartphone snapshots.