One of the Wordsworth Classics editions of "Tales of Troy and Greece" has that as cover art ebay.com/itm/…
Unfortunately, I can't find a reference as to what the painting is... – SidJun 22 '12 at 5:59
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Frankly, I'm just as impressed with the guy blithely strumming the lyre during a monster attack. – T.E.D.♦Jun 22 '12 at 14:09
...in which case that isn't a dragon, but rather Cetus (or the Kraken, if you get your Greek Mythology from bad '80 movies like I do). – T.E.D.♦Jun 22 '12 at 13:53