The room needs some color added to it. You could do this with draperies and artwork, repeating the colors of the artwork in the draperies or vice versa. I would use 4 stationary drapery panels, 1 width wide each, hung from a rod (or 4 individual rods) placed just below the crown moulding.

Do you have a favorite color or a color that you've used in a nearby room that you want to continue using? If you could lean the mirrors on both sides of the china cabinet, that would give us an idea of what they would look like there. They may overwhelm things. It's possible that they could be used instead of artwork on the wall opposite the windows and would reflect the drapery color.

You could also add color with a table runner and/or a couple of bowls of faux fruit.

I wouldn't paint this Agreeable Gray or your furniture will sink right into the wall. Gray is on its way out so you might want to consider a color that has a warmer tone and is not so difficult to blend with other colors in furniture, rugs, drapes etc. I would put paintings rather than mirrors since this room needs more color.

This is your room with Agreeable Gray. I don't think this is the paint color for this room, Also I'm wondering if the table is supposed to be placed closer to the windows. Can't tell from your photos. Maybe the china cabinet should be opposite the windows.

I think gray or white linen sheers on your windows would be a good solution.

I'd like to see white or cream on the walls. If you have any colored or colorful plates, you could try those in the china cab.

BTW, I totally agree that gray is on the way to the exit, and that taupe and white are taking over, with white in the lead! It's a definite change from gray, which is needed after 8 or 10 years of gray. But taupe is also strong as a transition from gray to white or taupe.

You need to take some measurements into consideration. There should be at least 36-43" of floor space all around the table for chair scoot and sit area. No one should have to get out of their chair to let someone pass behind them and access a buffet. A rug should be that large but not run into furniture against the walls or baseboards. I suggest you pull all the chairs out like you were having a dinner party and everyone was seated. Then see how spacious or crowded the room is.

Maybe something like this Asian-look console from Ballard to make the room a bit less matchy-matchy. If you have the budget, there are really beautiful antique/vintage Chinese altar tables.
https://www.ballarddesigns.com/ananda-console-table/furniture/dining-kitchen/buffets-sideboards/13922

The mirrors flanking the china cabinet look great! Good to know that you like a neutral look so that I can quit suggesting you add color. A console would fit on the wall opposite the windows if you have 54" of space between the table and the wall, 36" for traffic and 18" for the depth of the console.

Do you love the green color of the china cabinet? It could be painted a neutral such as dark taupe or black.

So, looking into my crystal ball, I see a console in your future. Your 60" gives you plenty of space. Now you just have to find the console! And, yes, different from your table. We houzzers are sure to give you a lot of choices!

A console I like for your dining room

Click on the green line above.

I think the two would mix nicely. You already have a mix with your dark wood floor, green china cabinet and gray dining table and chairs. But if you’re uncomfortable with it, then keep looking.

You need something long and narrow, preferably light. I think anything heavier would clutter the space. This console in bronze with a limestone top would tie in with your mirrors.

Nice space.

Hang the mirrors -- tops even with top of cabinet.

Skip the rug -- none needed.

If you are worried about your furnishings visually disappearing into your preferred choice of wall color, the colorful fabric runner on the table someone suggested should prevent that -- and do choose that runner compliment the art you choose for the wall opposite the exterior wall.

Do not repeat the same style you have elsewhere.

Restoration Hardware has a new collection with this beautiful console which comes in the brass finish as shown or in a black metal finish. https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod14890128&categoryId=cat12710046

I will recommend a nice painting according to that dining room and don t put more thing on the wall " the less is more"

Best

With the two beautiful mirrors flanking the china cabinet, I agree that "less is more" and would love to see one large piece on the wall opposite the windows, above the console. Gallery Direct is a good source with great pricing.

I see various shades of green in your space. Plants and other items in green shades.

Your space is lovely! Can't wait to see what you do with it!

Check out our oversized artwork for that big wall by the table. Whether or not you use a black buffet table there, large artwork can bring a lot of interest into your space.

www.shoagallery.com

Some suggestions below. There are many colors/sizes available.