I totally agree with painting one wall yellow/orange and the others in white. A good choice would also be honey yellow or terra. I guess when people hear orange they freak out because they probably think about neon orange or something too bright and disturbing for the eyes. How about mint? This is quite a popular color this days.

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Okay, firstly, this is very difficult to do without seeing the room in person. So rather than suggesting a colour, let me tell you some theory and hopefully you can work it out. The painting looks a little yellow on my screen, I think it would look different in person. You want the image to stand out. What you're looking for is contrast between the image and your surroundings. Contrast can give seperation between elements and that's what you're after, the wall to receed behind the painting. white is not cutting it because it's competing with the image. The image has some light bright tones ie it's bright and the white wall will be bright, so a while wall and the painting will both compete for your attention. the other problem you have is all of the other elements in the room are darker and warm timber, we notice warm colours before cooler colours (ie blues) first, so it's likely all of thu sis competing against each other. So to not compete with everything else, you want something cooler but also not saturated (without a lot of colour). You want people to forget about the wall. again it's very difficult without seeing the room, so any colour I give you is not going to work. Get a few swatches from Bunnings and take them home and hold them next to the picture in the room. Narrow it down the 3 paints then get a small canvas, Bunnings is cheap, paint that with your colours and rest them on the wall with the painting. Move the canvas around the wall. Good luck. Colour is difficult but just try and get something that doesn't compete with the painting.

Totally paint it! Really I like the tasteful matte black or white chalk paint with natural wood lid as you inspiration. But also what a fun opportunity to inject some colour: navy, mint, teal, yellow, orange can all work depending on the decor. ;-) You have inspired me! I am thinking to paint our chipped, ugly, red glossy piano too now. And I think it will get more use as a result too. Show us what you do!