I see you said you have nominated “graffiti” - I know there are places in the world where these are accepted, but please know that Niantic will remove any they consider to just be vandalism. This is a clarification that can help with street art nominations:
Murals and Street Art
Murals are great works of art and therefore eligible along with street art. Each mural should be a single Wayspot unless it has sections that tell a distinct enough story or are physically separate. Works that are considered vandalism would not qualify.
The mural above is a great example of a large-scale mural in a public place that highlights an event of importance to the community, and is most likely commissioned.
This mural (above) is a great example of street art that is distinct, unique, tells a story, and uses unique materials to create artistic value.
Vandalism
The street art pictured above may have initially been a good example, but due to the overwhelming number of names and different styles added to this piece, there is evidence to suggest it is not an intentional work of art and is therefore not eligible.