This is just a doodle I did, based on the underside of a bridge near where I live. This sketch took about an hour and a half of sitting under said bridge, which was fairly peaceful, since it's not used a great deal. I'm going to be going over this with my tablet, and colouring it. Eventually, anyway.

Enjoy the graffiti. The two designs on the bottom wall are original, most of the rest was what was actually there.