You have to tell the difference by looking at the teeth.
"Robert Fawcett" (1903–1967) trained as a fine artist but achieved fame as an illustrator of books and magazines.
Born in England, he grew up in Canada and later in New York. His father, an amateur artist, encouraged Robert's interest in art. While in Canada, he was apprenticed to an engraving/engraver. He attended the Slade School of Art in London, then returned to the United States to pursue a career in fine arts, although he had to work as a graphic design/commercial artist to support himself. He soon became disenchanted with the poor pay and political infighting of the fine arts world and decided to commit himself to commercial art, where he was successful. He was the author of On The Art Of Drawing.More Robert Fawcett on Wikipedia.