Artists beware. At least one person on DeviantArt is putting pictures under Creative Commons, then when you take them up on the permission… they remove the licence from the page and falsely claim you ‘pirated their work’ and that they want $600 cash.
Those using ‘stock’ and CC pictures should always, as I do, keep ‘a PDF save’ of the page showing the licence or permission. Then you can prove that such a person is lying, if they make such a claim.