Artefact location: 3rd image along centre at the bottom of image at the edge of the kerb. (white marking)
Looks to me an intended marking reminds me of like a kanji painting of a demon symbol.
Take note of the strokes, especially the part that would be the teeth. Looks similar to the evil boss dude from 'Samurai Jack' a carton from cartoon network back in the day.
Was also made sure to be made whole in the photo not a partial, definitely deliberate placement.