BuckeyeBilly Loc: St. Petersburg, FL

You are correct, as the following article confirms:
https://thelawtog.com/copyright-laws-for-photographers/

Blair Shaw Jr Loc: Dunnellon,Florida

I would have both signatures or remarks printed on the backside of the work since it is now a collaborative piece and no money is changing hands. Whatever the two of you decide is what would be appropriate because it could become a partnership later-on and who knows what new ideas may sprout from this first association.........?

Be kind & gracious and it will follow you throughout your existence.

fiat76 Loc: PA, MD, and SC

Thank-you!

via the lens Loc: Northern California, near Yosemite NP

While your photograph is copyrighted, it cannot be used, theoretically, without your permission, anyone can copy it, as your friend has done and that, in most cases, will not be against the law. Copyright does not guard against someone using your photograph as a base for an artist rendition. In this case, you, after the fact, obviously gave the person permission. The artwork belongs to your friend solely. Your friend, if desired, can give some type of attribution to you. How it is done is up to you and your friend. Perhaps your attribution goes only on the back with the artist signature on the front. I've given photographs to several artists over the years that they could use as a base for their art and in those cases I ask nothing back. I have had, however, an artist who did give me attribution. There is no "rule" here.

drobvit Loc: Southern NV

All photographs are automatically copyrighted when created...shutter click, done deal.

https://fstoppers.com/originals/know-your-rights-basics-photographic-copyrights-203294

fiat76 Loc: PA, MD, and SC

...and the plot thickens! Actually, I do not know the artist and I did not give her permission to use my photograph. The artist is a friend of a friend. I am leaning toward having her sign the piece on the front and putting my attribution on the back. As someone previously commented, perhaps this collaboration will develop further, and in that case, we need to cross our t's and dot our i's.
Thank-you for your comment!

bleirer

According to the article you need to give permission in writing or it isn't permission. The other artist should be informed that doing this violated your copyright.

ecurb1105

Tempest in a teapot. Either sue for copyright violation or let it go.

fiat76 Loc: PA, MD, and SC

I do NOT care that she used my photograph! I apologize if I have given that impression. I was just asking for advice about signage of the prints. Obviously she is the artist and should get top-billing. I was not sure if I, the photographer of the image she used for inspiration (a very good rendition), should receive any recognition/ attribution.