Very nice scene and render indeed! I would suggest you put some accent lights somewhere - replace the vegetation between the sofas with a floor lamp giving some reading light, maybe on the shelves. Also I believe the sofas are a bit too large, i. e. not scaled correctly, what is the height of the seating? They seem unbalanced in the whole scene, you have only wooden floor and wooden shelves on the left side of the scene, maybe a colorful rug there or some extra large vases would be in place. I would also put several art works on the walls and not a single one, or if only one it should be even larger.