I am often asked what makes the rooms I create so warm and inviting. The biggest key is in the layers. I believe in keeping it simple and keeping it real.
Layering works. Next time you enter a warm and welcoming room, you can bet it has been well-layered. It is full of dimension and interest. Your curiosity is peaked because you can't fully see everything it has to offer. Colors, textures, patterns are playing off of each other. It can be like the old trusted friend who is quietly waiting for you and says, "come, sit, and tell me all about it".
The picture below is a great example of layering. Your first layer is the outdoor view, then the wall color, art, curtains, lighting and accessories. The bedding starts at the wall color, art, headboard, down to the pillows, sheets, duvet, coverlet, throw blanket and finally the footboard. Even the flooring is layered.
courtesy of Restoration Hardware
Don't forget the lighting. A good place to start is with overhead lighting such as skylights, recessed or track lighting. Then come down to the mid-level lighting such as windows, specialized lighting for art and cabinets, sconces, pendants and chandeliers. Next is task lighting such as table and floor lamps and finally down to the floor with base lighting in cabinets and stairs and up-lighting for plants or to brighten up a dull corner.