The third room is too low, too big and too empty. What content is there doesn't mix well. It's a very large, badly wall-papered, low cieling room with a fan and doors from a space ship.
The assumption is that you showcase your best work. You're not giving us much to look at. Put more height, angles, and items in the scene so we have more to look at. The bathroom is the best shot, simply because there are items and angles that play in the spaces between shadow and light. We have to look around the picture to discover it, while the large open room can be entirely seen at a glance. We are not left wondering what is behind this, or in that shadow, or around that corner.
That being said.... it's a bathroom. Not too exciting. You're going to have to work harder to WOW us.
Please try to take peoples comments with a grain of salt, and use it to improve. Look at some of the better showcasees here and see how others are making more interesting scenes. It's a good start.
Best of luck with it.