For light-weight shading, you should also use a pen that's as thin as possible – this fashion you’ll attain smoother gradients. Overlapping Strokes: Layering or overlapping lines can produce a perception of thickness. This system is particularly valuable with pens that have a uniform line width, like good lines. https://beaurbgkm.bloginder.com/37727551/the-basic-principles-of-ink-drawing-for-beginners