This image is full of historical figures of the past, who would be considered iron men of their time. If your wondering about the first one, that is a beach lifesaver winning the Nutri-grain Ironman competition, one of my hero’s from the 80’s. These guys doing tri-athlons were truly amazing, muscle bulk and extreme stamina.
The rest are historical figures, all hand drawn from a number of images, so no single source. Hence Copyrighted. So go away Marvel Lawyers