Don’t be afraid to mix styles of furniture in a room. The sofa in this room is traditional, with a feminine curved back, and the side chairs are more straight and modern. If your sofa has a skirt, the side chairs should have exposed legs to keep the room from feeling too heavy. The key when mixing styles is to always have a clearly defined color palette.
Also consider mixing materials in a room. The tables shown here offer a nice range of texture: the coffee table is glass and the vintage French side table is metal. The mix of materials all work to keep the room interesting and your eyes moving, achieving a chic, luxurious look.