Vignettes by Fernando Güell

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I was browsing through INDUCKS when i came through this,drawn by Fernando Güell: inducks.org/story.php?c=D+19710
 It seems that it is part of an series called “ Egmont Vignettes Library”, which contains a bunch of traced (?) art from Barks stories. 
Most of them are referred by their matching stories. But the thing here is, how are they copied? How do you think they are made?
  Write what you think!

[Deleted]

Hello...
Anyone here?

[xanderares]

I think they are illustration obtained by tracing vignettes of classic stories, this is because they give the paternity of the idea to Carl Barks

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I recently updated a vignette by reporting that it was taken from a panel of Test to frostbite pass

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Anyone know which story this comes from? inducks.org/story.php?c=D+19711 
 Probably from a Barks ten pager...

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Help wanted...

[Orora]

Carl Barks's art is traced A LOT.

There is also French artist Claude Marin who has often been traced for decorative illustrations or one-page mystery comics (even as a kid, I noticed that).