There's a publishing house in Spain that is rumoured to be unscrupulous in its methods. I have found by chance the cover of a book of theirs and I am almost certain that it is a copyright infringement of an illustration of some well-known illustrator, but I do not know who.
I'm almost sure it's copyright infringement, because at first glance you can see a technically good painting that contrasts with a series of additional details of very rough quality. If you buy the rights of a profesional fantastic illustrator you don't usually spoil his work with shoddy homemade additions.
Can you help me identify the picture with the dragon?