Everything you have is brown. First of all, get a large rug and put all your furniture on it. These pieces are bulky, so buy a glass and metal coffee table to lighten up the space. Or, are you planning on changing your furniture? If so, don't go with brown or black, and buy something more streamlined and shapely. Those wires coming from the TV don't look good. Is there no way to place them behind the TV?

You haven't said what style you like. It's difficult to make suggestions without some input from you first.