A short clip focusing on some simple ways to practice line control for strait lines freehand. You can always use a ruler, but it tends to make all the freehand stuff look more wrong, and if you can do strait-ish lines without one, it tends to lend to a more flowing style.
Read more about this kind of exercise on these posts
http://makingcomics.spiltink.org/basic-drawing-exercises/
http://dd.salgoodsam.com/pattern-texture-and-technique-exercises/
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