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See how on the original the shadow on his forhead has a place where it bends harder? Its because the head is not a perfect ball, its sides are cut off. Practice by drawing contourlines all over the original. Would be better though if you had something where you could validate what you did. That is a big part of what makes shading just look like a different skin color, it doesnt follow the real form of the object.
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>>7957004
In terms of the physical technique: it depends on the medium. With graphite you have multiple options: hatching, blending with a paper stump, gradual smooth layering, etc.
In terms of WHERE to put the dark and light areas: that depends on the light source and the form of the object you’re drawing.
At your level you shouldn’t worry about lighting though, just focus on getting the lines right. If the drawing doesn’t look good and show 3D form as a pure line drawing then shading won’t fix it.