I've been trying to attach an image plane of graffiti onto a very bumpy surface, and using a subsurf followed by the shrinkwrap modifier, this has been my best result so far --
It's not bad, but doesn't necessarily feel like graffiti, it seems more like something hovering above the surface. I also don't like how parts of the underlying geometry poke through the image plane. I was wondering if my settings were correct, or if maybe there's another preferred method when you are dealing with a highly displaced surface? Could UV project be used instead of shrinkwrap for a better result?