The part that I see as the main issue here is that you say that you found the item. Finding it may not mean owning it. Did you find a copy online or at a museum? You are not the owner. Did you find it in your attic or purchase it. You may indeed be the owner of the the physical photo. However, just like owning the physical copy of a book does not mean you have the rights that a copyright owner has. You may or may not be the copyright holder. It could be public domain or copyrighted by someone else. There can also be multiple copies. There are many long and involved threads on this that you may want to look at.

What makes your situation more questionable is that you say you found it. Finding something on ancestry or anywhere online does not make you the owner of it.

That said, I do think tree owners should have a few more options, than we currently have.