I tend to agree with SAMS3d (sharen) - I think its a lighting thing. Maybe put a roof on the bathroom (to cut the sky light getting in from above, and try different lighting angles with a spotlight or something - mainly thinking lighting the scene from a point closer to the ground. A slight/small amount of fog or some other foggy volume material may also help a bit in the abandoned look.

Dreams are just nightmares on prozac...
Digital WasteLanD