Lighting, the lighting is ass. Wall are blank, they should have some value aka paintings/windows maybe even a mirror. You must balance your detail, the lower half of the screen has all these complex shapes and wine glasses etc and the top half is blank blue walls. Protip music makes what ever you're displaying worse or makes it look like you're trying to cover up for something, specially if its loud.
Ceiling corners can help remove that stuff look on walls.
Brown + blue = stuff.
http://colorschemedesigner.com/ Use colours that'll help each other out. I don't know much Blender but if there's a flood fill light, put one in and turn it to about 0.25, this'll help with the extremely dark shadows. Also as a bonus if you do research, see if there's ambient occlusion in Blender and use it.
Not the best example of AO:
Left is your model, right is with AO on. Having this on your room would dramatically increase its detail.
Here's my room I did for a lighting assignment, I did the models etc expect for the couch.
