Every now and then (usually by young, or not so young, inspiring artists) I get asked about the brush I use for inking. My answer is always Winsor & Newton, series 7, size 3.
Here's a little example of what you can do with it, with a little bit of practice.
I've inked the whole panel with brush. Except for the straight lines, of course. Enlarge the pic to see it 1:1 as the original drawing.
I've erased the pencil, corrected some details with white pen and scanned it as line art.
Normally I'd ink the small figures in the background with nib, but this time I did it just to show the range of the brush.