Make it believable in the modeling stage. For example, the pathway between two walls on the
right side is just too narrow for any practical purposes and it immediately throws off realism.
I think you wouldn’t see such architecture anywhere.
Next, think about your lights. What is the source of your light? Is it the sun or is it artificial (lamp)?
If it is the sun, it must be coming throught the window, right? You can add stuff to drop some shadows on the scene,
perhaps the cross inside the window frame or some leaves from a tree (you can use an alpha map of leaves in
front of your light source behind the camera, for example). Add some normal maps for the floor and wood,
perhaps tweak and experiment with your glass material a little bit more, add a rug in front of the cabinet for a little contrast…
keep at it!