11 - Solid Drawing

http://www.danrstack.com/twelve/

This refers to giving an object volume and weight. Utilizing solid drawing techniques can make a character or object feel as though they exist within a three dimensional space. Solid drawing is one of the more difficult principles to master, and when done poorly, can distort the proportions the object or come across as unconvincing. When a skateboard does a kickflip, it rotates around the z-axis and shows perspectives of the object not originally shown.