Rav Yitzchok Zilberstein discusses almost exactly this shayla in his newest sefer, Chashukei Chemed-Nedarim. The shayla presented was a little different. A wedding photographer put up a pic of a chosson whose wedding he had photographed in his shop as an example of his work. The chosson felt embarrassed and wanted the pic taken down.
Much of what is discussed is ownership of pix at events like weddings. Of course the photographer may have a stronger contractual baalus on pix than a random dude with a smartphone. RYZ does discuss in general terms as well, not just the professional.