I like the dark gray, which is what I was going to suggest, but you've already bought it! The pillow looks good too, but you could also have gone with a soft gold, which might be hard to find. If you can get an ottoman in a matching fabric I'd go for it. Especially if you read or relax in this room a lot.

If the starburst mirrors are the same size, they could work. I don't think something smaller will though. This is from Joss and Main and is 35x47 so it's quite good size and only $115. https://www.jossandmain.com/Almond-Blossoms-by-Van-Gogh-Canvas-Print-TMAR6641.html?piid%5B0%5D=10615119#readmoremodal1 This is 40x40 from One Kings Lane. $239. https://www.onekingslane.com/p/4511869-nell-waters-bernegger-palms-in-rain.do?refType=&from=fn $260 for this-also 40x40https://www.onekingslane.com/p/4530843-mary-h-case-boscage.do?refType=&from=fn Here's another by the same artist. You could get two 30x30 and put them next to each other. https://www.onekingslane.com/p/4530843-mary-h-case-boscage.do?refType=&from=fn

There is no way to know what the buyer wants in terms of the color of chair they would want or the color of seat. One person may want the unpainted wood and so they would never buy a painted chair. Another would be thrilled with a white painted chair. People may have very specific ideas about the fabric on their chair and it is so easy to recover a chair cushion. As mentioned earlier, these types of chairs are selling for such a low price, and with their matching tables. I would just sell them as is, and people can change them as they wish.

oh. your trim would work with a lot of colors I suppose. Cream. Sage. Vibrant green(even though I hear you want to move away from green, but as a possibility) . Subtle light blue-or maybe turquoise. Coral. Mustard might work. Wallpaper can be truly fabulous. Depends what feel are you after. What are furnishings in the adjacent rooms, colors there, etc.