One other thought

When creating a scene its important to model and texture each item as a model unto itself, so that it could stand alone as an item of interest. If you focus too much on the entire scene its natural to overlook small details that make a difference.

I was watching a movie the other day and paying attention to the items in the room. The set creaters had detailed it right down to the pull cords on the window blinds.

Details sell it as real if done right