how about orange cushions and a rug under the couch

I think you have plenty of options. What colours fo you have in adjoining rooms? What colours do you like? I could see lime green or turquoise or teal or pink. Agree that a carpet would help.

What about a few big brightly coloured ones all with different patterns? Or even just a black & white pattern, with mostly white in the pattern if you don't like bright colours?

Tan/beige (to take tones from wall art) with a duck egg blue. Quick search found this pic for inspiration

East-meets-west in San Francisco's Russian Hill · More Info

Terri Ferdinando-Yellow/light gray,light burnt orange with white or cream,a shade of mint/sage,new electric blue/with burnt orange

Go for lots of pattern to break up the dark, solid couch. I would use warm, natural colours like soft orange or pink that pick up the artwork and rug.

Hi Terri, to be honest I just did a search through the Houzz product range under "rugs" to find it to give you an idea of what is possible. you can find all sorts of stuff that would really work. I don't know where they are located but this is the link https://www.houzz.com.au/products/buraimi-faded-ivory-pink-orange-floral-motif-rug-prvw-vr~44133219 I did the same with the cushions on google. All the best. Regards Terri Ioannou