Re: When you gotta go...

I agree with the water comment.  About the lighting, though; while you did well
to make the lighting more patchy, uneven, and somber, the extremely directional
spot effect really distracts.  Depending on what sort of lighting method you're
using, try using multiple low key lights to illuminate different parts of the
scene to give a more presice effect on each.

You may also want to put some grunge and rust along the top of the urinal.