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Texture, color, and pattern.

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Value and variety

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Color?

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color

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Unity and value

# data[].attributes.body
Texture, Pattern and shape

# data[].attributes.body
Shading and value

# data[].attributes.body
Line quality, value, composition, using sharp tools.

# data[].attributes.body
Shading and texture

# data[].attributes.body
Drawing skills (technical), composition, lighting, form and value

# data[].attributes.body
Value and shape.

# data[].attributes.body
depth and form

# data[].attributes.body
Harmony & Unity

# data[].attributes.body
Shape, value

# data[].attributes.body
Form, value, shape, line

# data[].attributes.body
Concept of depth and shading, composition, color theory

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My answer written here.