Lighting is important in any room but even more so in a small room. Keep window treatments light and airy so that the natural light can shine through or have drapes that can be pulled back to let the light flood in. . For evenings or when there is minimal natural light use additional lighting to maximize each area of the room. A dark corner is a great place for a floor lamp or an accent table with a lamp for reading. Wall sconces take up little space and can be used to highlight a certain areas of a room. Lights over artwork add an additional layer of brightness and highlight the artwork. I try to have at least four levels of light in a room- natural light, dimable ceiling lights, floor lamp or sconces, and table lamps. Do a visual check to see if the four corners of your room have adequate light.
Many of these ideas will work in much larger rooms too. The most important thing to remember is to select furniture that is the right scale for the space you are decorating.
Find interesting ways to store the objects that are needed in a room, e.g., storage cubes, baskets, covered decorative boxes, ottomans, etc. This room has a lovely wicker basket which serves as an end table. On the shelf is a fabric covered box and the coffee table has a lower shelf which can be used to store books, boxes, baskets etc.Sometimes the more space you have the more objects you accumulate. Keep shelving organized.
If you have a sofa or sectional that you need to keep and it dominates the room, paint the walls a shade that is just a bit lighter than the upholstery . The eye will move across the room rather than sticking on the sofa. In the room above a stone wall harmonizes with the sofa and the warm yellow from the wall is picked up as accents.