The palette
Two decisions, and they pull against each other. The sea surrounds everything: a deep ink gives a pale island set on darkness, a pale one gives a softer print in which the shape reads less. Then the green, which here only serves the high ground: there is no lowland green on Bali on this map, so give the flanks of the volcanoes a value marked enough to hold the top of the sheet on their own. The interior will stay pale whatever happens, and that is right: it is on that pale ground that the lines of the slope become visible.