I have been trying what I understand by shading with line.
For a large part of this, I felt like it was a form of cross hatching as there are multiple ways to follow the surface of the body.
At the bottom I started to block in as I was not clear how to deal with large toned areas, but it is a bit patchy as I resisted blending.
Also the drawing is quite light as I wanted to show what I was doing with the lines.
Overall I felt a bit lost with this, please be as critical as needed as I would really like to understand this approach better.