I had an artist render a cover art image for my first novel, and it came out amazing. He's asked if he can put it up in his personal gallery, and I'm worried that that will somehow count as the image being previously published and therefore ineligible to be used as a cover for my book. I'm not sure if this is really a thing or not, but I know that you're discouraged from putting chapters and such up on forums or Facebook etc because it will count as the work already having been published. Am I just being paranoid? Can anyone chime in on this?