Before starting to draw any sketch you make sure that the surface you are using on which you have putted you sheet for sketching is clean or not because clean surface didn't create any mess in your sketches while a surface with some minute particles left on it makes a huge impact on your sketch while shading any area of your sketch. While shading if the surface is not clean then you can see the darker dots of that minute particle appearing on your sketch, making your sketch with no clear finishing and also makes you and your client unsatisfied.
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