Hi, new user here so excuse me if this has been covered - I did try a search!
I want to do some rough pencil drawings of 1940's film stars. I will be using photos released by the stars' agents (publicity photos), and other publicly-available photos as reference guides - but my illustrations won't look remotely like the photos. I hope to include my illustrations on a book cover - do I need to have copyright clearance from the photographers?
thanks!