Hi all! So a local artist would like to use one of my photographs of a musician I shot and create a painting(he specializes in that). I am wondering if he needs my permission at all to do so. I am unclear on creating derivative works. Is it true that he would not need my permission at all because once he turns my photo into a painting it becomes "his". What are the rules with this? Thank you! Any links that one could provide for reading up on this topic would be great!