Line drawing detail

Not easy as you have to try get it right straight off but I like drawing in pen. Difficult to know where to put lines to show detail as some lines in the subject were very subtle and its difficult to be subtle with pen. It was a case of using less pressure for subtle lines and reinforcing more dominant lines. I think it may be a case of 'less is more' with pen drawing and its important to consider each line and its importance. To overdo the lines can be a problem and there is no rubbing out with pen.