hey traveler,
I like the basic shapes and the tiles on the floor. Personally I think there is a bit too much bumb on the walls, floor and tub. The wall structure is nice but maybe the color are a bit too even (a layered shader with some dirt on the top layer might help).
I also think you should try having different shader for the inside and outside of the bathtub. I know that 3d-textures are great, but here I would probaply experiment with some 3d paint (even the one inside maya)
I'm sure you a aware of this, but I thought I would mention that the overall atmossphere of the image will greatly improve when you render shadows. You might want to consider installing a script called GI_Joe (a fake global illumination plug-in) it hels making great shadows for something like this. Another render tool you might find helpful is "ray-difuse" which can add shadows where surfaces meet (corners, line between floor and wall etc.)
Hope any of this was any help to you!
Jeppe
Jeppe Nygaard Christensen
Ghost aps, Denmark
https://www.ghost.dk