Draw buildings in shadows with thicker traces, and structures in mild with thinner lines. Test it by yourself: draw a circle, then go over The underside of it with a heavier line and right away it gains volume and seems like a ball. Overlapping Strokes: Layering or overlapping traces https://howtodrawwithinkpens83604.get-blogging.com/37528455/5-easy-facts-about-ink-pen-drawing-techniques-described