No. This face isn’t photoshopped in. And no, I didn’t see it as I was speeding by in the train. A lot of the fun of shooting the tunnels in the dark is you really don’t know what you’ll find. Sort of urban archeology.
Anyway – from what I can tell – it looks like a print of the face was stuck to the wall. Whether it is the face of the tagger? Or a friend? Just a nice mystery for now.