Thanks Mikael and jock, that's very interesting.
Through Google I've found a 1938 film, <a href="http://imdb.com/title/tt0030068/" target="_blank" rel="nofollow">Donald's Better Self</a>, the poster for which gives a typical representation:
[link no longer works]
As for Faustus, I'd clean forgotten the reference! Presumably Hergé knew the story: he makes enough references to Gounod's version... And of course Rastapopoulos, as the Marquis de Gorgonzola, dresses as Mephistopheles in The Red Sea Sharks, only a few pages before Haddock's moral dilemma.
Ed |