Doubling up on over sized mirrors like these make an even bigger impact than just one large one! If you don't have a ton of room find a few narrow options. Notice, there are no patterns on the fabric and the rug is subtle. This creates a bit of calm drawing your eye to the over sized pieces.
Find a WOW element like this glamorous chandelier!
Take a look at the furniture you have, are there interesting carvings or curves? What made you fall in love with the piece in the first place? I love how the focal point is the dark wood of this furniture. The intricate design of the chairs pop against the neutral backdrop. This is a great design lesson, let the furniture speak for itself.(images from Horchow)
