Lots of short straight lines are not really the best way to lay in a sketch. Loose flowing lines result in more elegant and evocative drawing even at the sketch stage. But those feel more committal that little strokes so artists often resort to them when they are unsure of the direction they should take. There are no rules though. Whatever gets you to the finished work is fine so long as that finished work is accomplishing what you set out to communicate with the drawing.
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