I’m kind of disappointed. My first published Gig was denied because it says the photo was not originally mine. But I own those photos 100%. I even have the 3D model I made as well as different versions of renderings of that photo, because I made it. It’s just discouraging to have it suddenly denied and removed like that when I exerted a lot of effort drafting it. I hope Fiverr counter checks this issue.
If you had uploaded the image previously to the web then that’s probably the reason it thought it was not original (eg. their system might have found a matching/closely matching image on the web). You could contact CS with the proof (3d model/source file) and see if they accept it.
Make some changes on your gig image and republish it