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After you got that down, you could begin the process of blending. This part is fun. Take a tissue or cotton stick or even blending stomps. Gently blend it with in a circular motion. Then you should get something like this. Look back to your reference picture to check if the level of shade is right, meaning if it look like the reference picture. If not, add some more layers to where it needed to be darker. And blend it again.
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Repeating that process should give you something like this. The smoothness depends on what kind of paper you are using. I am using bristol smooth paper for this drawing.
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Hope this tip is useful to you. Leave me a comment to tell me what you think! Thank you.