Art or Graffiti, Saturated

Michelle W. showcased a saturated image from the streets of Montreal for the weekly Photo Challenge this week. She said that our photos can be any colour, even black and white as long as they are SATURATED. This is my second post because when I walked the dogs in the rain today, I saw these new images and wondered are they art of graffiti? What do you think?
graffiti or art
art or graffiti

Both photos were taken on the river bank, on the underside of the road bridges crossing the Exe. There is a lot of art there and it changes fairly frequently. I wonder if the same people are painting over their own work. Perhaps the nature of street art is that it’s transient.