For the high volume of sketches and exercises in the course, Stan suggests affordable, low-stakes options to prevent "preciousness" with your art:
: Moving from 2D shapes to 3D forms (boxes, cylinders, spheres) to give drawings volume. Drawabox.com Part 3: Advanced Fundamentals Value and Shading : Understanding light and shadow to create depth. proko drawing basics course
To give you context, here is how the Proko Drawing Basics course stacks up against the competition: For the high volume of sketches and exercises