The Getty Museum store has 8' exhibition banners--used--for $50/pair. (Betterwall has a more varied selection, but theirs are more like $450.) Here is a pair from Getty if you want to stick with a Japanese theme.The only other affordable thing I know of that can go in that space is a Kuba dance cloth, but that then would require you to start a collection of African art and artifacts (which would look awesome here, but maybe isn't your thing).I included a modern Chesterfield from Crate & Barrel. Not so trendy as the one you chose above, it will stay classic till long after I'm gone...

You have a grayish wood look floor (linear pattern) with another color wood shelf (linear pattern) and a third wood linear pattern on a wall. 2 out of 3 need to go away. If you want to repeat the floor tile on the wall, that would be fine. But there are too many lines and too many woods. Painting it won’t help with the lines.

You might also consider pressed metal wall art. If you like music, you could focus on that theme: https://www.ebay.com/itm/164052298799 https://www.ebay.com/itm/TrebleClef-Black-Musical-Note-Music-Metal-Wall-Art-Decor/153839029144?_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D1%26asc%3D225085%26meid%3Dd4be207d83a54d30b922d5c0faa0c77d%26pid%3D100623%26rk%3D1%26rkt%3D6%26sd%3D153580763612%26itm%3D153839029144%26pmt%3D1%26noa%3D1%26pg%3D2047675&_trksid=p2047675.c100623.m-1 https://www.ebay.com/itm/MUSIC-MUSICAL-SMALL-VERSION-WOOD-HEART-NOTES-TREBLE-CLEF-WALL-ART-DECOR/333137467780?_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D1%26asc%3D225085%26meid%3D3bd6740fe0b540afb31fdbe05a838fa1%26pid%3D100005%26rk%3D5%26rkt%3D12%26mehot%3Dpf%26sd%3D153839029144%26itm%3D333137467780%26pmt%3D0%26noa%3D1%26pg%3D2047675&_trksid=p2047675.c100005.m1851 You could also add wood related items, including an actual guitar or any musical instrument or even music related art made from wood. https://www.ebay.com/itm/Sing-Word-With-Treble-Clef-Laser-Cut-Wood-Wall-Art-Decor-Music/333342757798?_trkparms=aid%3D1110001%26algo%3DSPLICE.SIM%26ao%3D1%26asc%3D225085%26meid%3D5bc81f7047ee44c59138591ae6535dfd%26pid%3D100005%26rk%3D6%26rkt%3D12%26mehot%3Dpf%26sd%3D333137467780%26itm%3D333342757798%26pmt%3D0%26noa%3D1%26pg%3D2047675&_trksid=p2047675.c100005.m1851 Or add pictures or posters (framed or unframed), even abstract art with that same theme. https://www.bing.com/shop?q=pressed+metal+wall+art+music+&FORM=SHOPPA&originIGUID=A06FB88FF1364E6A9BB53EE23FB0BD95  You could choose the beach or the mountains or race cars or sports or even outer space as your theme. What interests your family?

I'm sorry to have to agree with the commenters who have said the tin ceiling was a mistake. It must be something you really like or else you wouldn't have done it, but it really fights with the style of the rest of the house. While you didn't need to be a MCM purist, going so far afield is really jarring. I am also cringing at the thought of dark gray LVP. Gray LVP is now only being done by flippers and as a trend is on its last legs. It also doesn't convey cosy to me. Since it's already in the kitchen, what's done is done, but I can't see what is in the great room currently. If it's natural wood, refinish it, but not to gray. A natural color would look fine next to the kitchen floor although it's less than ideal to have an artificial product next to a natural product. If you had come here before starting your kitchen remodel and presented your choices I would have suggested you consult a real estate agent and consider moving. This doesn't seem like the right house for you. I like to be able to tell people they should do what they like because it's their house, but your style and the house style are too divergent. If it doesn't make you uncomfortable, tone down the traditional elements to live in harmony with the house.