Since one of the mediums I work in a lot happens to be photography, I never have a shortage of image files to work with in my art studio. However, a lot of artists who paint do not dabble in photography and struggle with finding images that are 'kosher' to use without infringing on copyright. Well, yes, then there are some who never concern themselves about that at all and as a photographer, I find that disregard to be along the lines of piracy!
But, there is a way to get your hands on images and use them legally. The nice folks at ArtSpark explains how: