That is looking quite nice! Get a few more objects in there to fill the shelving and tv stand and it will look great.
You could always use a “person” of about 6 foot height for reference (or just make a cube 6′ tall and 16 inches wide) then scale everything in your scene. You’ll be able to see how the proportions look.
Make a copy of the file before doing this then play around a little.
