The first thing I would do is switch your light fixture to track lighting. That way you can focus the light onto that wall much like what is done in an art gallery. I also think that may stop the reflection you are getting. I think putting cabinets on the long wall will really close in the space. I would make your red wall your gallery wall. I'd frame everything in white so they "pop" off the wall. The problem with the other wall being the gallery wall is that it's just to narrow. You can't really stand back far enough to see the art.

It's great to see professionals consider sustainable options

Hmm, I'd aim for balance. The last time these colours were in fashion, in the very early 1990s, I had light pink, light blue , light green and black. In some rooms there was white instead of black. They all worked well together. There are lots of recent pastel rooms on Houzz photos. Also florals are about to appear on the scene, in big digital murals and digital printing on cushions, on rugs, etc. it's a modern version, but still florals. Pink and the pastels work well with florals. Which way does the room face? If it faces South, in the Southern Hemisphere, go for a warmer colour.

I haqve just seen this , and it is well over a year old , so presumably you are well into renovations , or maybe finished . Here's my take though -- probably too late though ! Your picture looks like those 70's photo's that faded and yellowed ( sorry to be rude ) . So freshen and modernise . Paint the walls white -- not beige or yellow . It will look so much 'cleaner' . redo the dark uprights and base boards -- I can't tell if they are dark green , or black , but I'd do black stain over it . The fence I would also do in black . The yard , step one , would be hide and soften it . The Cape Cod chair paint in white , with the pailings in bright primary colours -- each one different . Add 2 or 3 planters -- different shapes and sizes and heights , but all stained a nice Kwila brown or charcoal or similar . Big leafy plants , cactuses , yukkas , maybe white and light brown pebbles , marigolds , colour , texture , different height plants . Personally , I would go further -- paint the roof , rip up most of the pavers , possibly even change the windows to bronze or charcoal frames . Just some quick ideas from an experienced amateur haha .