One of the most common mistakes in decorating is to fill a room with furniture that's too large for the space in question. Opt instead for smaller-scale pieces, ideally ones that can serve multiple purposes. Before making any purchases, use masking tap to mark out the footprint of the furniture you're considering. It's one thing to read the dimensions on paper; it's another thing to see how much space would actually be occupied.
Clear out the clutter, selecting only a few statement pieces to add interest and draw the eye. Also, trade bulky curtains for window treatments that are more streamlined. Indeed, mere inches count toward executing the illusion, and exposing more of the wall can help you achieve the desired result.