A few classmates of mine were with me when I opened your thread, and the immediate response was that the toilet spot was relatively small compared to the water sink on the top.
I like the shaders, though. The stairs look like they're mapped with fractal or marble or cloud - not sure which - and I'm sure you liked the reflection with the semi-metallic look on the.. phong (It looks anisotropic, though.)? Anyways, keep it up! =)