Alcohol-based markers are a medium that shuns both hassle and mess, and are fairly easy to use once you get the hang of it. The colour choices are abundant, the colours are vibrant, and they’re extremely fast to dry, so there’s no worrying about making any accidental ink smudges or waiting for them to dry.

Because the best markers are alcohol rather than water-based, they rarely damage the paper. However, unlike paints, the ink will bleed through the paper unless you’re using coated sheets. The techniques I use here won’t work well with coated paper, so I’d suggest placing a bit of scrap paper under the drawing to prevent the ink from bleeding through to the next surface. Because the colours are dyes, they don’t do well with sunlight either,
so make sure you don’t expose your drawing to the sunlight after you’re done to prevent it from fading.