You could also bring in some texture with bamboo sticks or decorative branches and help balance a bit the height of your room with small scale furniture. Spray paint them if you find the perfect size and shape but they aren't the color that you need. Ikea carries white decorative stalks for a very good price. the ones in the 1st picture hold well with small kids around and you don't need a vase for them. there are washi paper or crinkly paper floor lamps with a soft beautifully diffused glow For a budget friendly version check ikea or target http://www.ikea.com/us/en/catalog/products/80028552/

I agree that a tall lamp would be a very good idea, but I think the most important thing you could do would be to get much fuller curtains, and I've picked some that reflect the luxurious fabric of your couches. Because they are dark, I've balanced them with really bright art and a pair of light vases on the table that seem to me to match your pretty light chairs rather well. Keeping it simple. http://curtainscolors.com/black-curtains-and-drapes/black-curtains-with-flower-prints/ http://www.overstock.com/Home-Garden/Simone-Floor-Lamp/6959500/product.html?refccid=IBIYZQPPC6HK5VCI6GZDDB3RNY&searchidx=113 http://denkurki.com/floating-glass-wall-frame/ http://www.popsugar.com/home/Trays-Coffee-Tables-28942992#photo-28942992

Depends on what effect overall you want -- hot tropical feel (oranges and reds) or a bit more toned down? You can take inspiration from pictures of gardens with lime green heuchera or sweet potato -- often paired with chocolatey purple, silvery greens and blues.

The colour examples are in the FB link bottom in the text.