1.) ink the picture for me, this basically means tracing over the original pencils with a single line of ink. In reality, however, I like to apply the line width variation as I trace. The process is done stepwise for the sake of clarity.

2.) apply line thickness. after determining which line you want to thicken, simply go back and stroke the line again, slightly altering the path of the original line. for example, if you want to taper a given line, start the second stroke outside the original line and allow the two lines to gradually coincide as you go down. Repeat the process as ncessary to achieve the desired thickness.

points in the lineart. points occur in a variety of places, from teeth to hair to corners of buildings. When two lines taper at the point (left), the result is a finer, more delicate point. If the lines thicken at the point (or more naturally, one thinkens and the other thins) (right), the result is a more flowing, dynamic point.

joins in the lineart. When a line terminates against another line, that line can either thicken at the base (left), (more common) or become thinner (right). The first option allows thinner interior lines to merge into thicker, outline lines effectively.

continuous lines. In general, free standing continuous lines (which do not join into another line) are thickest at the apex of the curve (left). Another alternate style that I sometimes like to use is to add a corner to the outer edge of the line while leaving the inside edge curved (right), which gives a greater emphssis of change in direction.