I generally don't get a chance to do what I would consider finished line work like this. Usually my line drawigns only serve as a ground or boundary for me to paint over or within so I don't worry about having good looking energetic lines as much. Actually I used to do mostly oil paint so the lines wouldn't show at all but lately I have been thinking a Lot more about line quality as I moved into watercolors. I new I wanted line to be an iportant factor in my watercolor art as that is one of the main things my oil paintings were missing. SOmetimes I would love the drawing I did for an illustration but then loose that spontaneous energy when slaving over an oil painting in which the line ulitmately got covered up. It's much easier to swing your wrist with apencil and get a great arch than to do so with an paint brush loaded with thick opaque paint.
Recently I also got my first chapter book gig in which I will be doing lots of finished line work and now just foudn out about a second chapter book that I will be starting up in the next few months.