The first and the third image look nice, but the second looks terrible! It has the look of a collage of different elements where shadows don't mix and match, and light doesn't appear to bounce of surfaces. Plus, almost everything seems to be all diffuse and no specular/reflection.
Don't get me wrong, the 1st and 3rd are good work! But since I have nothing to add to these I only say my criticism about the second.
On a side note: the first image need a brighter exposure to look more realistic. We (3D renderers) tend to not want to lose any of the dynamic range, thus making images like this a bit darker than interior photographers would do (and by consequence than we are used to seeing). Typically, for a hygienic setting like this the white would be a bit overblown. I've attached a version that's corrected in Photoshop to be both brigther and less saturated in the top white wall part - for the same reason: the white needs to feel like clean white instead of browny orangey. In reality the color bleed is there, but our brain compensates for this because we know for a fact that the wall is white, just like white paper seems white to us when held under a tree in the shade, while in reality it is greenly lit. Also, the lower wall part under the marble top and sinks (behind the towels) appears a bit too uniformly lit. You'd expect a bit more feel of shadow here. Potentially you need to make the inside-underside of the marble top a lot darker so less light is bounced back on to the wall.