If you follow these steps diligently, then you can create great line arts. If you are an amateur and looking for methods to create great line arts then you can follow these steps one by one.
Make rough sketch first. Never make dark lines while you are making rough sketches. If you make dark lines, then you might have a tough time erasing it and it will lessen the texture of your art.
For the next subsequent steps, create a darker shade and an even darker shade at the last. This is how you can get great line arts.