Originally posted by edith
My question then is this; how can they display their work for sale, when even to display a piece of work copied from someone else's photographs or other materials - and not acknowledging the source - is a copyright infringement? Isn't it?.
I see you are from England and I am not familiar with UK copyright laws. However, in the U.S., if you take a photograph of a famous person, you only own the copyright on your photograph...you do not own the rights to an image of the famous person. You cannot just make a photographic copy of the photo for commercial use without the copyright holder's permission. However, you can certainly use the photo as a reference for a painting in another medium without the photographer's consent.
In the U.S. there is another issue, as famous people have a "right to publicity". That is a right to exploit their image for commercial purposes.