Drawing the strains closer alongside one another will give your sketch an effect of darker shading. Similarly, drawing the lines far aside will give it gentle shading. In this article I've briefly summarised a couple of hatching techniques for yourself. You will also find sample pictures with the techniques https://inkpendrawingtechniques82219.educationalimpactblog.com/56614970/ink-drawing-for-beginners-no-further-a-mystery