1- There is too much artificial light in my opinion that there is not much shadows appearing. Try lowering the intensity or use less light. Or let the sun shine through window and global illumination do the work. Some HDRI environment would be cool, so we see some scenery from the windows.
2- I think floor is too reflective and you can use some tiles bump. Also couch seems too reflective (you can see carpet reflection on the right couch). You can try colors for the couches as well.
3- There are floating boxes in front of windows (not sure what they are)
4- Green color of the plant at the middle doesn’t match with the rest of the scene. Try lowering its saturation values.