Decades after fine artists embraced photography as a tool for drawing and painting pictures, illustrators remained wracked with guilt about the practice. Artists such as Cezanne, Van Gogh, Degas, Gauguin, Toulouse Lautrec and Eakins enthusiastically used photographs as a starting point for their work. They openly enjoyed the exciting new medium. But illustrators-- nursing a giant inferiority complex-- remained concerned that using photographs might somehow be cheating. Norman Rockwell…