Cleopatra and Anthony (1902) by the great American Illustrator Joseph Christian Leyendecker (1874-1951). This is also a very typical Art Nouveau illustration and much more erotic than Leyendecker did normally.
Dying Amazon (1905) by the German painter Franz von Stuck (1863-1928). A great Art Nouveau painting, more ornament and color than realistic image. Nevertheless a very erotic piece of art.