I think what is missing in the renders are the little details. Things like:
Wall power outlets
Wall light switches
Other items to make the spaces look "lived in".
These are the types of things commonly missed. When people do remember the little items it is what makes a render realistic. The best advice is research home magazines and really look at the pictures and see all the small details and not just the space overall.
The last image for example only has 5 items in the shot:
A painting
lamp
table
sofa
chair
things you could add:
Magazines or books
rug
plants
The other things is don't always take the obvious direction of the light. Here you chose the light to come through the windows because they are in the scene. What about placing the light coming through a window behind the camera? Not as obvious and can add more realism.
Scott