The first thing I noticed is that the angle the sun is hitting the mountain would mean that there would be some direct sunlight coming in the windows, but your light looks pretty uniform and diffuse.
Experiment with where you put your camera, and explore adding both color and general variety to the light. And, say, what if you painted one of the walls? What if the window frames were light yellow? The bathroom would look really good in mauve … you get the idea. 