I have requested and received permission from several RedBubble photographic artists to use one of their photos as a model for a painting.
When I finish each painting I will post it to RedBubble, as a ‘collaboration,’ with attribution to the photographer, and a link to the “Model” photo.
I will let the photographer know when it has been posted, via BubbleMail. A high resolution image of the painting will also be available to the originating photographer via email if desired. He can then post it to RedBubble (and/or other similar sites), and sell prints etc keeping all the profit from such sales. This license will be limited to the originating photographer only.
When I sell the original or prints (or products) of my painting, I’ll keep all the profits from those sales. 8-)