The first thing I notice is that there are certain spots that look bland/flat (examples: the floor underneat both the right hand lamp and fireplace seems shadeless). I have no idea what it’s called so I’ll call it an “Ambient Occlusion thingy”.
Even though the room itself is filled with furniture etc… it just doesn’t feel like anyone lives there. Some magazines on the viewers’ side of the coffee table, a folded blanket on the side of the sofa or a painting/picture above the fireplace would break the flet feeling the overall image has now.
It has the potential to end up looking incredible! Keep up the good work.
If I were you, I would add some normal mapping (for example for the bricks of the fireplace) so as to give you materials more volume. For your lights you can probably achieve something better with just a bit of composing. Also, try not to align the furniture perfectly, it looks strange and artificial to me.
Other than that, it’s a pretty good interior. Good luck with your lights.