I once picked what I thought was a soft orange red for our bed room. It turned out to be Home Depot orange. As my husband refuses to paint a room more often than every 5 years, we lived with that orange. At least I was mostly there with the lights out, and it did make our north facing bedroom more cheerful. But for some reason we found ourselves at Home Depot much more often then!

You have a mixed colour palette & an eclectic range of furniture which means that you will end up with a very interesting room indeed. First suggestion: reposition rug so that all of the sofa sits on it equidistantly. At the moment your main colours are: chocolate; white; tan and grey from your sofa, entertainment unit, dining table, kitchen etc. These colours always look great together particularly if they are teamed up with black. So I think if you choose the right artwork with these colours; add copper items to top of your tables and choose cushions in these tones the whole room will come together. You will successfully mix old and new & it won’t be too bold for your taste. Note: artwork should be purchased first & be landscape in orientation. Could your existing artwork hang in the kitchen or hallway as it would be seen from the main room? To give you an idea of what I mean see pic below. Not suggesting that these items are what you would personally choose but focus on the colours and how everything is tied together. PS you could put some of your ornaments on the coffee table.

I can really recommend the Danish brand "Rug Solid, which have rugs made totally out of recycled materials. This is a photo from our living room, where we have a recycled cotton rug from "Rug Solid". http://rugsolid.dk/en/

bigreader has had some excellent tips. The rug you've chosen is lovely, but you definitely need a bigger size. A larger rectangle size might have more underneath the couch. You can check out online options. The blue is fantastic, once you have that repeated around both areas your room will have much better flow. One other thing to think about when you are ready to change your lounge is to get something with a lower back (same with dining chair), these help a more visual flow than high back chairs.