I don’t have anything to do with the appeal request, but I try to help new folks make a stronger appeal if I can. Is there any evidence that you can provide that these should be Wayspots other than that they exist?
This clarification makes clear that graffiti that is vandalism should not be a Wayspot:
I don’t have anything to point you to about tiles, but I have seen other post here about Niantic removing them. If the tile is on a single family private residential property, then it is ineligible, even if you can reach it from the sidewalk: