I post accessories because it would matter as to your art.... https://www.etsy.com/listing/915171928/18x18-throw-pillow-cover-thick-linen?click_key=00a9f6202d0d370c94866a7792e57679f5864f1f%3A915171928&click_sum=13fd9e20&ref=internal_similar_listing_bot-6 -------------------------------------------------------------------------------------------------- https://www.etsy.com/listing/877047017/william-morris-throw-pillow-cover-morris?ref=listing_page_ad_row-5&pro=1&frs=1&listing_id=877047017&listing_slug=william-morris-throw-pillow-cover-morris&plkey=2181f9bb37e207d1eaef8b9df895fd763e6e75b4%3A877047017

Consider stacking the three pieces vertically on the right side of the buffet. The bottom piece at about 5" above the buffet and the others one hand's breadth apart as you go vertically. Place a lamp that reaches the mid point of the stack at the end with the outlet. In the center place a pretty bowl with fruit or some stable decor items. Think about framing the pieces with a slim metal frame/ You can repeat that metal with the lamp and other accessories.

The bed frame seems more Beaux Arts to me. Perhaps something like this in place of the travel poster. https://www.greatbigcanvas.com/view/lermitage,1993348/ And a set of small vintage frames on the window wall next to the bed.

That's a 5' square (25 sq ft of plates) and it looks too small! That wall is huge. I've lowered the plates and spread them out to about 8" apart.... 28.5 sqft. Oh, and added a roman shade to disguise the discrepancy of window heights.