The History of Cast Drawing, and How It Can Help You Draw Form

Copying is a way of understanding and seeing, and a staple in the training of professional artists.
Amy Whitaker • Art Thinking: How to Carve Out Creative Space in a World of Schedules, Budgets, and Bosses
Know what the old masters did. Know how they composed their pictures, but do not fall into the conventions they established. These conventions were right for them, and they are wonderful. They made their language. You make yours. They can help you. All the past can help you.
Robert Henri • The Art Spirit
When away from model draw from memory. Draw also opposite or very different views from what you had in the class.