This is a supportive image for the original artwork done by the same artist; Paolo Uccello. This one is done around 10-15 years later and is also oil on canvas. The same figures are present but are much more developed than the previous work. You can see he has developed a much better sense of perspective with the background as well as the foreground looking more realistic.
Image Credit: http://www.wikiart.org/en/paolo-uccello/st-george-and-the-dragon
Reuse License: Public Domain