You might try 4'x6', landscape format. We typically start by centering the object around 5' above the floor. Might work better a little higher but you can try it out with tape.

Beautiful image. As it's so large, I'd place a timber hall stand underneath it, and lean it against the wall rather than hang it, then I'd place a collection of relevant objects on the table. 1. A lamp, perhaps a ceramic base with native American colour and shape, or simple pottery base. With a simple calico shade. A pottery or timber low tray with some tactile collectibles, like some river pebbles, different rock, a piece of and old timber branch, thats been smooth by touch, or timber carved balls. ( I know you're probably thinking what?) And lastly, I'd hang it above the picture, or rest on a table a feather headpiece. You can get these online, even I've seen them around Melbourne in odds and ends stores. Maybe if it's on your table, a timber head that milliners use for a display. You could continue this look with an Aztec looking rug or cushions to break up your leather couch. Mohair throw might look good too.

That artwork is fabulous. I think it really suits the room actually - just a few tiny accents of colour around the room and it will be very very nice. I love the cushion suggestions in the above by asquithoatley. Some low, small cement candle bowls with a touch of painted colour could do the trick to tie the artwork to the coffee table.. and a dash of colour or white on the table would do nicely. The table and the artwork really hit it off in this room nicely.

Hi. Yes, me too, number 3! Some really beautiful pieces of art being suggested. Wow, such vibrant colours. May I make a suggestion? Maybe it's just me, Terri, but try rearranging your rug so that it runs widest ACROSS the room, not lengthwise. It will fit under your furniture better, and although as much of it won't be showing, I think it may look better, given the size of the geometric pattern. I'm curious to know what you think. :)