Here are some line and ink sketches that I recently created.
I really enjoy using this medium.
I normally try to develop the line and wash together, rather than 'filling in' a line drawing.
I like the line to remain crisp, so I dip the pen in a waterproof ink and then use a water-soluble ink for the washes.
Here, I've used Winsor and Newton inks and a Speedball pen on smooth hot-pressed paper.
I always let ink dry naturally. I never use a hairdryer!