Whatever it is you want to learn to draw, learn the:

• Perspective for it
• Life study related to it
• People and pose study related to it
• Light study for it (form, then volume, then placing shadows etc)
• Layouts/Panelling related to it, so copy comics (includes manga/manhwa/manhua)
• And (privately) copy from other artists related to it
• Mix these up daily to avoid boredom :P

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Book recs:

• Color and Light: A guide for the realist painter - James Gurney
• marshallart.com's perspective lectures
• Sycra on YouTube
• Drawing on the Right Side of the Brain - Betty Edwards
• Anatomy: A complete guide for artists - Sheppard
• Anatomy for the Artist - Daniel Carter & Michael Courtney
• Atlas of Human Anatomy for the Artist - Peck
• Colour: A Workshop for Artists and Designers - Hornung
• Human Anatomy: The definitive visual guide - DK

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Example of an artist workshop course

Week 1

• Lecture: gesture drawing and the element of process
• Homework: 100 gesture drawings (half should be from life, the other half from Old Masters drawings, paintings or sculptures). Choose 5 of your best gestures to submit for critique and instructor feedback.

Week 2

• Lecture: Connections, shape, and understanding the skeletal landmarks. Differences in gender, range, and mechanics of movement, and design of the bones.
• Homework: 25 construction drawings. Choose 2 for critique.

Week 3

• Lecture: Head drawing, skeletal construction, design, and anatomy of the human head.
• Homework: 25 head constructions. Choose 2 for critique.

Week 4 and 5

• Lecture: Muscles: Torso/Trunk. Placing the anatomical shapes of the upper and lower torso based off of the understanding of the skeletal landmarks.
• Homework: 25 construction drawings per week. Choose 2 for critique per week.

Week 6

• Lecture: Structure and Anatomy of the Leg and Foot
• Homework: 25 leg and pelvis constructions. Choose 2 for critique.

Week 7

• Lecture: Structure, design, and anatomy of the upper arm and shoulder
• Homework: 25 shoulder and arm constructions. Develop the anatomy of the upper arms together with the anatomy of the upper torso. Choose 2 for critique.

Week 8

• Lecture: The structure, construction, and design of the forearm and hand
• Homework: 25 shoulder and arm constructions. Develop the anatomy of the upper arms together with the anatomy of the forearms. Choose 2 for critique.