A green roof pairs well with gray and white homes. For a subtler look, pair a green roof with a siding in a lighter shade of green. I think you are on the right track .You have chosen harmonious shades . New paint doesn't have to match existing colors, but it should harmonize. Some general tips are- Green roof - Gray, green, or white house colors. You could use a dash of yellow also.

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 front door is around the other side by the way! The windows are aluminium so cannot be changed. It is all rather ugly at the moment.

Thanks for the suggestions. I will definitely try to attach rounded tiles where I can to make it more Spanish. Also love the idea of attaching Spanish style tiles to fronts of steps etc. I will definitely do bright contrasting front door, and I really like the window flowers idea to break up all the walls. Landscaping is my strength, so got that sorted, and will begin that first. There is too much focus currently on parking spaces, and not enough on outdoor living. What do you guys think of this colour. I am happy to paint over the aluminium windows with whatever colour would suit best. Thanks very much.