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For Sky.
When you approach shape, think of weight, and how it fills the atmosphere. It does take time to get used to drawing shape drawings where they don’t look flat, but the more you practice that without relying on shading AND color, the more your drawings will start to take weight themselves. ESPECIALLY for your anatomy drawings.
Continue to practice drawing full shape objects, like apples, oranges, pears, bowls, until you start to get a sense of weight, shape, and line. Then, you can apply that to anatomy, vehicles, buildings, AND even backgrounds.