CPS sketching technique

by using this technique you can draw almost any painting or any sketches I’m using normal color pencil nor polychrome neither any cope color marker its just normal color pencil. Now you have to do this

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Make 3 box name it 123 then

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Color the boxes with lighter darker and darker now here is the COP sketching technique

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By using this technique you can fill almost any structure but you have to understand the shading techniques you can observe shading by viewing pictures of leaf or you can take pictures from net