Tiny drawings

Hey Marco, I like to use Muji's ultra fine tip (0.025) pen for very thin lines and a pilot 2020 mechanical pencil for precision as well! I don't know if Muji sells that pen where you are, I bought a bunch of them in Taiwan the last time I was there :)

Only downside is that they aren't waterproof, so make sure if the ink gets wet, it's intentional!