Photos?

Lighter colors (pastels, whites, neutrals) will open up the space. A monochromatic color scheme; the use of mirrors; 1 large painting rather than a group of small ones; not too many accessories or the room will feel cluttered. Lots of lighting ... recessed is great for a small space.

Definitely lighter wall colors, or even a darker color on the bottom and a light color on top. Be careful with your window treatment that it doesn't block any light. And you'll want your ceiling color to be white. [houzz=]
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Paint The Walls & Ceiling The Same!
When the color is continuous you eye is fooled how tall the ceilings are.

Applying the same color to walls and ceiling also makes your painting job easier, because you won't have to tape off the molding at the ceiling line.

Exposed beams.