I brought two pens with me to test on my 2-hour flight from Seattle to San Jose: a Staedtler and an Ohto, both ostensibly 0.05mm in width. The Staedtler was much finer, but both pens were really excellent to draw with.
I did the bulk of this cottage drawing with the Ohto because it’s better suited to the scale of the drawing – nice blacks in the shadows.
Originally, I was just going to do the little fence drawings at left, but I wound up doing another, and then that led to some foliage, and before I knew it, a cottage had crept in.
My idea in doing this was to see how well these pens worked for drawings that would have washes added. This one has a lot of ink, probably not suitable for a wash, but I got carried away. With some restraint on the inking, I think either of these pens would work well for a line-and-wash with watercolors for the wash.