They haven't say what will do about all this issue, i think to stop this giveaway and make a new one would be a wise desition and if he decides to move on with this image, then they will only prove how they give zero fuck about the artist, and that is not fair.
Many might get surprised, but the truth is, it is perfectly legal to edit a publicly available image and using it to a different purpose, other than it was originally intended.
Reference:
https://en.wikipedia.org/wiki/Cariou_v._PrinceIf anyone of you care to check origin of the puzzle image, you'll find that it is not the high definition one sold by the artist. It is a low definition representative image readily available on Google hosted by various web portals.
Moreover, in conversation with artist, CPD Project claimed that they purchased this final image from another artist, based on relevant keywords. If that is true, then they do not have any moral responsibility either, because, they paid for it themselves.
In any case, if the artist still believes that using this image for puzzle is illegal, she can always move to court. But, to the best of my understanding of this issue, she has a lost case here.