ok this is is gonna sound super moronic but do you have pics of ufos in stock sites??? i mean if you do they go as editorial? LOL i doupt you can get model  release from alf lol
i have a picture of a Big ufo over new york.ofcourse is photoshoped but can i post it on adobe for instance?

As long as you designed the UFO yourself and as long as there is no copyright in the photo of New York then yes you can upload as creative.

If the UFO doesn't belong to you, then you can't upload it at all.