Hatching to Create Form and Volume

This is another exercise from the online course, "Beginning a Nature Journal." The purpose here was to practice hatching and crosshatching to create three dimensional forms and to give a sense of volume. What I learned from this is avocados are a challenge to draw and have look right with just a fountain pen. 

Dragon Fruit

A couple variations of dragon fruit. I got one because they are such interesting looking things. I find the taste somewhat bland, however. I drew this partly for myself and partly because how I was drawing satisfied a homework assignment for Danny Gregory's klass in the currently ongoing Sketchbook Skool's Exploring klass. He asked students to work on something with hatching and stippling to help create volume and depth in an object.