May I suggest a cap of your pavers on the wall and the a slightly darker gray that relates to the privacy fence beyond? That way horizontal surfaces and vertical surfaces show similarities and blends/blurs the separations?

Looks like the dark window trim is trying to steal that beautiful ceiling's thunder. I have had both stained and painted trim. With stained trim I stayed with lighter colored, neutral/dusty wall colors as not to compete, lending a warm look. With light color, painted trim work, I could go more colorful and the trim really pops, Rooms look fresh and bright. Practically speaking: White trim required more frequent cleaning, but was much easier to repair and repaint the dings and scuffs. Polyurethaned wood trim required less maintenance but it was trickier, especially moisture and sun damage. Beautiful space, by the way!

Oops! Your trim looks grayish blue to me. Sorry, didn't see it is charcoal until afterwards...well in that case, I think I would still do gable and wrought iron as mentioned but then try a bright yellow, like SW's BEESWAX is paint color. Are you in the islands? Sorta has "that look". Envy : )

The photo gives a bit of an idea , but an inside shot would really be needed , plus an idea of your favourite things . Probably the two best guesses would be art on the walls , and/or plants . Plants would only work if it 2 metres or more deep , but boy could you have fun , with different coloured leaves , textures , heights , leafy plants , cactuses , all sorts . A marble statue or a rock water feature depending on style and taste . Art is more personal -- family photos may be important to you , or you may like WW2 planes , or large colourful abstracts may suit your tastes and draw looks . Other things like a wallpapered feature wall , even timber may work , but you need to suss out what suits YOU -- unless you want a home and garden magazine clone .