Generally: use a pencil, not a pen, erase parts you don’t want any more. Or work digitally and lower opacity of early roughs to work over in greater detail. The

Generally: use a pencil, not a pen, erase parts you don’t want any more. Or work digitally and lower opacity of early roughs to work over in greater detail. These are all examples of blocking in a simple shape and refining it towards an ever-more detailed drawing. They are rendered in ink lines because that is far easier to reproduce.