Brontosaurus. I admit that by scientific standards nearly everything about this picture is wrong - the size and shape of the limbs, the swamp-wallowing lifestyle, the position of the nostrils, the shape of the head, the erect posture of the Allosaurus in the background, even the very name Brontosaurus. (This animal is properly called Apatosaurus.)
But. You have to admit that it captures something essentially sauropodous that many more accurate pictures completely lack. The very substance of brontosaurosity is captured on paper. I love this picture in a way I never could a modern restoration.