Follow this throw pillow equation
To accent your couch, place two 20-inch-square pillows in a matching bold pattern in the corners. Overlap them with two 16-inch pillows in a coordinating solid color. Add one lumbar pillow with a subtle pattern (like a pinstripe) for balanced design.
Hang artwork at the right height
Most people hang artwork too high. Place a piece so its bottom is only three to eight inches above furniture—lower for large pieces and slightly higher for small pieces. When there’s too much space between furniture and a painting, the eye rests on the void, blank wall between the two pieces.
Rearrange the bookshelves
Organize 60 percent of books vertically and 40 percent horizontally on the shelves. This creates balance yet spontaneity (and shows off the back of the bookshelf if it’s lined with a decorative fabric). Stack horizontal books lower than vertical ones: If the vertical books are 12 inches tall, place three to four books horizontally up to four inches high. Add green plants to soften the bookshelf, but avoid flowers, which can look cluttered and distracting.