Posture runs hand in hand with proportion. Posture is the way we hold ourselves and has a direct relationship to the changing nature of proportion. As you can see in the example opposite posture is informed by directional lines that are determined by the angles of the body and the relevant proportions in relation to your body when you are in a pose. Posture also allows us to understand and come to terms with the human form that exists in space on a two dimensional surface. The posture lines usually follow the central dynamics of the pose, and pick up the changing edges of the form on the main parts of the body. You should always give lots of consideration to how you pose your model, because the posture will say so much about your drawing and what you are trying to achieve through it.
One way of using postural lines is by extending them and in doing so one can find relationships that extend to other objects in a drawing. This is another way of making a drawing have proportional accuracy. It also creates an analytical directional tension in the drawing.
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