A quill pen, eh? I don't think I've ever used one of those. Just a paint-brush with ink. Looks very nice! I can't say if I have any tips. o__o Just keep using it and you'll come up with techniques naturally.
Mhmm, I've been playing around with different art tools and what not, I like it because it creates different pressures so the line isn't all one width. I was inspired by learning what tools mangakas use.