I think the white trim gives it a much more contemporary look. It's more work to have it done in a different color, but the overall look is cleaner.

This just popped up , but I see it is quite old . Did you decide on paint colours ? The roof looks almost a brown tone in the photos , but you say it is dark grey . I assume you don't want to paint that ? If you do , go more charcoal IMO . If you don't , I'm assumimg it will look several shades darker with your wall colour choices . There is a roller door on the garage that appears to be a nice shade of orangey yellow . Personally , I would go with your colour choices , but do all the doors ( roller doors , wooden doors ) and gutterings in that ochre shade . Your terrace I would do in a charcoal , but with the top rail either in the orangey yellow , or a really crisp white . I know that sounds a bit 70's ( although they would have added a lot of ranch brown back then haha ! ) but against the light grey I suspect it would work together well , and look the part .

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.

I had a similar situation replacing a thin porch roof, the down pipes that spoilt the simple lines that the posts and flat roof had, basically down pipes just looked just looked heavy and ugly. I fitted the gutters in level as these are short anyway and don't need a fall, but left off the spouting. Then by suspending a heavy* galvanized chain from the centre of the outlet down into large buckets set into the ground, which is filled with rocks or small lumps of concrete, the water will trickle down the chain. (that is a thicker gauge, not heavy* weight). You might also want to anchor the bottom of each chain onto a lump of concrete. You don't have to anchor the bottom, but you don't want anyone to be encouraged to swing on them. Obviously you won't see the buckets, but do need something to capture the water that runs down the chain. Small holes in the buckets allow water to run out gradually. The chains will hang down straight under there own weight, the look is more 'elegant'. If you get so much rain blowing off the chain that it blows onto the posts or house, it's very likely you won't be standing outside, unless you like getting soaked.