First you should draw the landscape which you want to draw but remember draw it with light line and then start shading with a mechanical pencil or you can use HB pencil. At last just remember work slowly .
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firstly you gotta visualize the drawing and then start a light sketch with a HB or 2B pencils. Then you can go on developing and darkening your sketch by adding more details. for a soft shade effect on the drawing use cotton by rubbing the shade.This can help you make a sketch beautiful...