The palette
Water leads everything here. The Floating Harbour, broad and settled, and the New Cut, quicker, cannot take two treatments: a map has one ink for all its water. Their shapes are what keep them apart, so the water needs a frank colour for both channels to read. The gorge to the west wants to go deep and dark, a recess rather than a feature. The centre is a dense grey with no regular weave to fall back on, which means your water has to do the organising. Leave the motorway unmarked: its ink is also the ink of the main roads, and instead of a single point stopping dead at the edge of the centre, it would net the whole city.