I believe that the middle image in File:Collections mock.png is from Michael Jackson's album itself and is thus a copyrighted image. Taking a copyrighted image and adding stuff doesn't mean it can go into the GFDL because it was rendered through a GFDL program. I think it needs to be taken down and an example provided that uses only freely licensed images.
Topic on Project:Village Pump
Thanks for pointing that out, I've gone ahead and removed the file in question.