The stock he used is from: http://www.eoloperfido.com/portfolio.htm It's someones photography site. That photo was FROM THAT GUY's SITE! And the guy has a devArt account which he puts his pictures on it. Why don't you get your facts straight?
If the artist says you need permission from him to use it or you can't use it, it doesn't matter what site it is from, period.