This room is an exceptional example of a well-lit space. Look at all the sources of light! There are ceiling lights for general ambient light. Up-lights mounted on the wall send light to the high ceiling. The stair risers have lights to make it easy to watch your step. Table lamps provide flattering accent lighting and are a good height for reading as well. There are spotlights on each piece of art.
You can also see that in the dining area, there are spots set to graze the wall, highlighting its texture, plus a chandelier over the dining table and accent lighting inside the display cases. And don't forget the candles on the coffee table! The combination of all of these lighting sources gives a richly layered look to the room.
This avoids Mistake No. 3: Inadequate lighting.
I often see homes that have all ceiling lights, but no other light sources. Or absolutely no ceiling fixtures and just one or two table or floor lamps with dark shades. Neither scenario provides all of the light that you need.
A good lighting plan includes ambient light from ceiling or wall fixtures as well as natural light from windows, plus task lighting which may be for reading or food preparation if it's the kitchen. And lighting doesn't really feel complete without some accent lighting such as pretty chandeliers, decorative table lamps or lighting on art.