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When you get to the level of skills when a human body's proportions and anatomy are no longer a challenge for you, and you can draw figures from life using such knowledge on autopilot, then to go to the next step—it is good to use a more "artistic" medium like red chalks. This would be the time to try different creative tasks—not learning anatomy and constructive drawing but working on your own creative style, loosening your sketching techniques, finding ways of expressing yourself on paper.