In my personal opinion art is a little easier than science since im more on the creative side :)
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it is using black where the sun cant see in making it look more 3d
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You can also use a colorless blending pencil to help blend colors without adding any further pigment. To do this, lay down a fine layer of colorless blender first and then add your lightest color. Dark colors can be difficult to blend once they stick to the paper fibers, so this base helps alleviate that issue. Smudging With Paper and Tortillons
