5: FOCAL POINT (Line Weight: medium and heavy)
It’s very important to have a focal point – even on line drawings. In this case, the focal point is the corner of the car closest to the observer, or closest headlight. This area will begin with thick line weight that tapers as it flows away from the focal area. This also includes thicker line weight around the headlights (h). This is also a good time to indicate tire tread and black out grilles, spokes, and vents.
6: HATCHING (Line Weight: light)
Hatching is a quick way to indicate lighting. The hatch line should have uniform line weight. Sometimes it is best to hatch in the opposite direction when indicating a surface corner (i).
7: SHADING (line Weight: various)
When shading, try to shade in the same direction as the initial hatch lines.Don’t forget to vignette, or shade in a direction which starts dark and fades lighter as the shade moves away from the focal area (J).Again, the focal point should have the most contrast, line weight, and detail.
8: SHADOW (Line Weight: various)
Since the shadow is not really a part of the car, I chose to hatch in a completely different direction than the hatching/shading on the car in order to separate the shadow. The darkest part of the shadow is the area directly below the car, then, as it projects away from the car, the shadow should get lighter and more transparent (vignette).
From http://www.designertechniques.com/
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