I don't think the iron piece or the clock bring the color and softness to the fireplace that needs to be there to balance it with the rest of the room. I am pretty sure this was discussed before, but have you considered applying some type of conditioner or finish to the stone to warm it up? You can see from your pix that it reads very grey and cold compared to the rest of the space, and I think warming that stone up will go a long way toward integrating it better. In fact, if you did that, you wouldn't necessarily have to worry about colorful art. Second, I think you really need to consider painting the fireplace surround, either in a black or an aged bronze look. The brass really doesn't fit the feel of the warm and cozy space you have created. I agree with those who have suggested you need to group things more on the top of the ec. Rather than a line of items making essentially another row around the top, having a couple of more substantial groupings will carry the eye through the space with more interest. Use some stacks of books in a couple spots to elevate the various pieces and add more color. Add pillar candles to the candleholders in a rich red to bring some color in and increase the visual height impact. I would also take one of the smaller green plants and tuck in the bird cage, with the door open and the plant spilling out. I would also look for a tall floor plant to place at the end of the entertainment center, down by the console table, to break up that solid wood panel there. You could also hang three small art pieces, one in each panel, to help bring the eye into the space rather than have it stop dead when it hits that wooden wall on the end.

great advice upthread I'll try to be short, probably repeating several people: -get rid of the white console next to the fireplace/look for smth else instead if you need it there for function -think of other window treatments. curtains? woven blinds? roman shades? any of these will look better. move your sectional a bit from the wall, both to allow room for window treatments and because furniture generally needs at least couple inches to breathe..that wil also make room seem larger -you already purchased the ottoman in the same color and style of the sofa..off white, right? well something different would be better, but it's okay..buy a throw, fold it and put there to break your lines a bit. tray is great too-both for function and beauty. you'll appreciate it when watching this TV -I liked reading how your wife gets her art:) okay..so if there's no real room for other suggestions(I'm also prejudiced against mass produced canvas art..maybe she can be talked into a print instead?..)..put that art there first. Make sure it fits-seems huge?.. Say you go for that a very similar art, you have there-a bit of white, black, brown, indigo blue, fiery yellow white and brown you already have in your room (btw like your furniture) pull your other colors (in pillows and throws and accessories) from that art -deep sophisticated blues, golds. can be metallic accessories (like vases or flower pots?), can be softest fur pillows can be velvet, can be knitted throw. everythhing you buy-make sure it's a different texture..leather is sleek you've got enough of it. Speaking from experience-I also have my fair share of leather:) then look for a big ticket items like curtains and a rug. (or simultaneously..just keep your general scheme in mind). you can decide to make them fairly neutral. repeat the color of the furniture, just different material of course. or go for one vivid deep color but make it a shag rag for example. Don't try to match pattern to art..art has a mind of its own. Look at the room as a whole..what does it ask for? and know yourself of course..say I love many rugs but I don't like to clean them lol. You know whether it's high traffic area, what your habits are, and whether you'll be sad for 5 min if the rug will have spots and then get over it, or will be sad for 5 days. when you buy a side table try, again, to introduce another texture, just different material in this case. maybe wood. maybe ceramics(garden stool?some of these look really modern). every new material you bring creates dimension. Dimension is something you look for when creating spaces. Why? well that what we've used to. Ouside always has it. Even when it's a desert or an ocean. It has depth. we need to recreate it with all sort of ways and means that are availiable to us.. Good luck! will be a cool room edited because of thousand typos..))

Looking at the pictures again, I can see your above the sofa print would benefit from a mat. Reframing is expensive though and if you have a bigger piece for that spot, perhaps that's the way to go. Deco's idea of pairing the Chambers portrait with the two smaller pieces is a good one. Fori suggested DIYing the re-matting but I know I didn't manage it when I tried it and don't have the patience for it. Might be worth a try though. If I were going for a colour on the walls (I do love your current one so I resist the idea - btw, would you share the brand and name please?), I'd consider a lighter shade of those fabulous purple chairs. Purple is my favourite colour so I'm biased. The suggested greens are lovely as well. Purple and green are neutrals in my world and I have them in my living room as well. :)

Buy a second piece. Same size. Or find a larger piece you love. Or paint over an old canvas. Sand a bit if it has lots of texture. Prime with any latex, doesn't have to be white...leftover primer is great for this. So are sample pots. If you know any young kids, have them do it, restrict their palette to the colours you want (if you must). http://www.likemerchantships.com/2009/04/use-what-we-have-ugly-craiglist-canvas.html and https://theartofsimple.net/what-to-do-with-bad-paintings/