Here are the stages that I go through when doing an ink line drawing.
I first do several compositional sketches, drawing from photographs taken of the subject.
Then I do a rough pencil drawing on tracing paper directly over the previous sketch to establish the final gray and black tones.
I trace the previous drawing onto a piece of illustration board.
Using a technical pen I draw the basic outline.
Gradually I add the various tones using the photographs as reference.