I guess changing the colour was easier than making it look less grass-like.
Anyway, here are some things that I noticed on first glance:>everything is matte
The only thing that isn't is the bowl on the coffee table.
Why not give the lamp above and the coffee table some gloss too?>bricks are too big
You have 16 rows of bricks in your render. Now if you google "brick wall apartment" you can see just how little 16 rows is.>everything is too perfect, lacks "life"
Consider using more props, like a book and a pair of glasses, or a glass of water and a napkin, something that tells a story about the kind of person that inhabits this environment.
The cushions on the sofa are too perfect, maybe add a slight indentation, make them look just a tiny bit used so that it doesn't look so sterile / lifeless.
Other than that the render is good, it's really just these minor details that I think you should pay attention to.