Couldn't agree more with the comments above. I would only add sheers; they add lovely filtered light and keep the room looking clean. The full scale of the sheers also adds a sense of luxury. I've included a photo of a master bedroom where there were different size windows and even doors to a verandah. Unfortunately the photo doesn't show the entire wall but hopefully you get the idea. All have block out blinds behind them too. And another bonus; sheers are not as expensive as most other window treatments.

I hang mirrors professionally and think that jmm1837's reply is spot on. For a client of mine I would hold it up and make a decision in situ when the client thinks it 'looks right'. That said. I would probably start by recommending a position where the base of the mirror is close to being in line with the top of the bell jar. You want it to be high enough to not make the mantle top ornaments look cluttered. But you may also want it low enough to reflect a tall flower arrangement. Hope this helps.

When I started doing reno's, that was one of the first things I wanted to replace but the cheapest quote I could find was a touch under $3000 and that was from some random guy from Gumtree that I could barely understand. Everyone else looked upwards of $4000 and that's just for installing the new gyprock ceiling. I had plenty of other things that I needed to do the place, so I quickly ruled that one out. But now after living there, I don't even see the vermiculite anymore. I'll just try and work around it. My thoughts now are to... 1) Remove the ceiling fan. Get a pendant light (either 2, 3 or 4 from my very first photo). Keep the bar light. 2) Replace the existing fan with something more modern. Replace the oyster light with an understated ceiling mount fixture, or just keep the oyster.

Some good advice above. Centering a single, large artwork over your couch and adding tall lamps / greenery in the corner is the way to go. But there are no rules with art, and a piece that spans the full width of your sofa, especially in your space, will work much better than one that doesn't. The artwork itself is a very personal choice, but look for a piece that augments your scheme. Ours can be colour customised as you wish - this one could be a good starting point if it resonates with you