Shen.de
Don't listen to him. Must have had a bad day
No offense DIA
There are some areas of the rendering such as the coffee table that are obviously very nicely done and look the part. A couple of things that might help you achieve a better result:
_Definitely change or modify the picture outside, maybe adjust the levels and blur it so that it will be on a different plane.
_The drapery needs some sense of support, not sure if that line is it but it needs to be more obvious.
_The floor seems too bare even foe a bare floor, some indication of joints, tiles, whatever you think the ref. pic is showing. Also some rough reflections and highlights will help.
_Add a couple of pillow to hide the further arm of the couch, seems to abrupt, and even maybe a throw on the closer arm.
_Maybe a Small crouwn molding to accentuate the ceiling.
_Check the emitters that are illuminating from the outside, if u are using any. The ceiling could use a bump and a more gradient shadow to it.
Other than that your materials look well applied and it is definitely a good composition, much better rendering that a lot I have seen around. Now that you have this strong base rendering some small additions and tweaks will give you a picture perfect one.
Hope this helps, Great Job