The palette
Water is the strongest shape here, a broad river bending across the top: give it an ink deep enough to hold the bend against the dense streets of the centre. The airport inside the bend is mostly open land crossed by long strokes, and a background close to the paper keeps it quiet. Green comes in patches south of the centre; a mid-toned green lets the parks read as the stations of the boulevards. The ring of motorways is the darkest stroke of the drawing, and it can stay that way.