Hatching is a great way to start off adding a little shading and texture to a shape as part of your ink drawing. They are essentially strains jogging in precisely the same way layered beside one another - the closer alongside one another the traces, the darker the shadow. https://inkpendrawingtechniques44220.theideasblog.com/38334822/5-essential-elements-for-how-to-draw-with-ink-pens