I love to use various pens for various things. I take advantage of thick markers for giant shadows because they’re significant and chunky and canopy a great deal of paper rapidly. I like Sharpies for smaller sized shadows and thick constant lines. Inks like oxgall (created from oak galls) https://remingtonvjvis.mdkblog.com/40781179/the-fact-about-ink-drawing-for-beginners-that-no-one-is-suggesting