The palette
Water holds nearly half the sheet and it is all one piece: it is your principal colour, and it has to be frank, because the whole drawing depends on the outline of the islands. Then take care with the green, which counts here more than elsewhere: the eastern island and its train are protected and wooded, they make a real mass, and too timid a tone would hand them back to the built fabric. The built fabric itself can stay pale and even: it is the edges that tell the story, not the fills.