I have a feeling post #5730781 is a partial trace of post #3363929 (deleted, still available at the source here). The Loona part looks totally original, but the urinals look too close to be a reference IMO.
Here's one, two screenshots of the two images overlayed. Does this look like a trace to anybody else?
Also, if this isn't a trace, is there generally some way to tag one image as referencing another?