The white tiles not looking white can be either the camera settings or the light. Trying setting the camera to NEUTRAL, o changing the color of the light. The tiles to me look white though. Maybe making them a bit reflective will improve that. The floor also needs some reflections, bump and more depth to it.
To me your scene has a big problem with the PERSPECTIVE angle, its very distorted and that makes it look unrealistic, the tiles look way too large on the walls and too small on the floor. It looks like a very tight space and its not, I think you are stretching the Film Gate parameter too far.
Your materials need work, they look plain, the tiles need bump so they look real. The wood material under the sink is my biggest problem, try something else there. The little plant next to the tub is not helping at all, you can barely see it, its not helping the render, so either make a place for it or ditch it.
The towels on both images look messy, the bathroom looks like its for a high end home, and the towels look cheap. The red flip flops on the right need to leave also, if you want them there find a great pair that would add more to the image, I see the Versace logo there, why not putting some Versace flip flops (Not sure if they even exist, but hope yo get the point).
And finally all care products next to the sink shouldn´t be there. It all depends where are you trying to take your image, if this is the showcase of the bathroom no one wants to see mess next to a sink, you need to WOW the client, a couple perfume bottles would be enough.
Its a good start, but needs more time. Hope this helps!