Relax, draw freely and rhythmically, with the rhythm flowing out of the movements of the whole body, not just the fingers or arm. Over concern, anxiety and over cautiousness about the drawing will interfere with the study of the figure. When attention is focused on the model, the drawing will eventually take care of itself. The labored drawing often results from obsession to attention and fussiness to isolated details. Thus the drawing's relational activity is reduced.
Line can be a searching, sensitive, intimate and personal expressive means to drawing.
Scratchy, haystack and mechanically repetitive lines should be avoided. Variations in the physical properties of lines produce contrasts in line darkness, width, length, and texture. Experiment with drawing materials to find the limits of these possibilities. Consider looking beyond the representational drawing of the figure to the basic movements implied in the pose. Look for similar thrusts throughout the surrounding forms to emphasize their relationships.