But it's obviously camo. It isn't "exactly" a picture because it isn't a picture. I mean, obviously a roof can have a mural, but there is some artistic intent in a mural. A random camo pattern on a roof could be many things, but it's not likly a mural...
Artwork - Murals 
It isn't explicitly a "picture" but since it isn't really camouflage it must be some form of art. To me that would make it a mural.
Unless the definition has wide lattitude...