Allow more light to enter the living area by using light curtains. Instead of using heavy looking "valances" use basic and if possible semi transparent curtains that are sufficient to reduce glare which might be caused because of sunlight. Use brighter color schemes commonly known as "hot" color schemes. These create a very good reflection and transmission 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 and also other accessories have been fitted. Because anything in your living world is always "relative". The perceived volume is always relative to the empty volume that is definitely normally used for circulation. The more empty volume you get, the bigger the room will look.