(a) Every person who maliciously commits any of the following acts with respect to any real or personal property not his or her own, in cases other than those specified by state law, is guilty of vandalism:
(1) Defaces with graffiti or other inscribed material.
"Greetings, Starfighter! You have been recruited by the Star League to defend the Frontier against Xur and the Ko-Dan Armada."
It wasn't defaced with graffiti or otherwise inscribed in a permanent or semi permanent manner.
It wasn't damaged.
It wasn't destroyed.
It had some clothes, a hat and sunglasses put on it and I'm guessing after the picture (or pictures) were taken it was all removed. No harm, no foul. Just some fun and amusement.
So you are saying that anyone can run through Disneyland and change the appearance of the park for a few pictures? So if satanists had put satanic symbols on the indian "just for pictures" you would be okay with this? Or maybe the KKK come in and put a sheet on it for fun. Why do gay people get a free pass with everyone for doing things that are wrong? If another group did it, they would not get the "it was just for fun" treatment.