Firstly attention to details.
Some things that bother me when looking at this scene:
TV is a black plane : where is the reflection, how is it attached to the wall? No wall mount?
The cabinet beneath the TV again has no reflection. Add a vase or a book or something, vase : Spline -> Lathe, Spline loft -> Bend Twist.
The chair is just plane ugly, unless you have an Indonesian style looking garden or something I wouldn't use it.
The carpet... If you aren't used to work with fur material try a simple carpet texture with a cellular map in the displacement slot, ad a mix map, a fallof map in the reflection slot.
The couch: I can see the edges running on the spot where you rest your arm. To make a cloth material add a fallof map in you diffuse slot. Play around with the curve tool.
The plant in the back is to green, almost fluorescent. Tone it down, Add a texture to the leaves.
The floor could use some extra details aswell. Bump mix map : Scratches or something.
Your lamps are not lamps, they are just white dots. it's a daylight setting so use regular glass, or something.
And some additional idea's
- Add some photograph's on the wall.
-Reduce the bump of your wall.
And most importantly :
Corona is like making a soufflé, you don't want to take it out the oven to early or it will fail.
Oké all done :) Hope this helps.
