Thinner lines are typically construction lines, and the thicker the line is it is understood as an visible out. The solid lines are used mainly to define the shape and size of a structure or object.
The type of line indicates different things in an orthographic drawing.
Line Types
Drawing shadows is an important part of a 3-D drawing.
Drop shadow is a shape that is created by an object on a surface (or multiple surfaces) by blocking the light. To see a drop shadow you need a light source.
Shadows
Some tips on how to draw the head of your character
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