Batman or Darth Vader?

In a rush today so just snapped this bit of graffiti covered board which is blocking an arch window atop the building that Dry Bar is in.

Considering it's been there the whole 2 and a bit years I've lived directly opposite - it's interesting that when looking for something to Blip you notice the details around you more. Can't work out if it's meant to be Batman or Darth Vader on the right side of the board but I'd not spotted it before.