The artistic quality of your sketches is not the point. The real goal of sketching is functional. It’s about generating ideas, solving problems, and communicating ideas more effectively with others. By Mike Rohde
Sketching and wireframing are a specialized style of drawing, used for fleshing out preliminary complex ideas, group brain-storming, a lo-fi method for evaluating interaction concepts, and as a way of roughly perfecting a design technique. By Paul Andrew