Allow more light to enter the living area by using light curtains. If possible semi transparent curtains that are only enough to reduce glare that could be caused because of sunshine, instead of using heavy looking "valances" use simple and easy. Use brighter color schemes commonly known as "hot" color schemes. These create a very good transmission and reflection of natural as well as artificial light inside the living room. There may be one more different method to defining the perception of the living room (or any interior space) and that's the empty volume left behind after all the furniture along with other accessories have been fitted. Because anything in this living world is often "relative". The perceived volume is always relative to the empty volume that is normally used for circulation. The more empty volume you get, the bigger the room will look.