Paintings with frontal angles are almost always symmetrical left and right. The creatures or humans or cars or buildings in this world are almost always symmetrical left and right. As long as one side of the single drawing is followed by the other, the other side will also follow the completion in reverse. It is almost as suitable as mirror view (keyboard hotkey M) to draw left, right, up, down, back and forth symmetrical objects to solve the problem of parallax not easily seen.
Application of symmetry, layers, masks, gradients,inks, selections....
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