I'd like to give you a few comments on your pieces since they are lacking in quite some areas and do not do maxwell justice.
I'll only adress technical flaws since the design is set be the client possibly.
You need to do some serious work on all your textures, they look flat and lifeless.
The tiling is very obvious all over the place. An instant killer of realism.
The map on the leg of the chairs looks flipped around 90 degrees.
Have you used a mapped roughness in the floors reflective layer? You may want to do so if not. It will give you subtleties in the material that are essential to every wood material now matter how polished it may be.
Your textures will look much better in an instant.
The plant looks very flat, almost lambert as if without a texture.
The same goes for the stonewall, very dull and flat looking.
Light fixtures in the ceiling look just like grey cylinders when turned off, looks unrealistic.
Why not make more use of the sunlight (if the client allows that) ? You'll get much more dramatic lighting and nuances.
The perfect alignment of everything also distracts a bit. Maybe you can bring just a tiny bit of disorder into it (again if the client allows for that).
And lastly I think that your background image is way too lowres and weird looking. Did you cut out the sky in photoshop?
Again this all may or may not be doable depending on the client, but at least the tiling issues should be adressed.
I hope this all did not sound too harsh, just trying to help you improve your works. There is no progress without criticism after all.

Regards,
Ben