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These sketches hardly ever become anything more than random thoughts, the lucky ones end up being inspiration for something else. I find that it helps me to have a lot of sketches laying around because over time, their meanings change which allows me to see them differently. The silly drawings are important not because they are strong art, but because they can always lead me to something new.
Of course, sometimes I do start with the end in mind. I have embarked on a series of pieces (undetermined number in the series) that feature my artwork as a dominant element of the environment. These pieces have to have human characters in casual poses in order to work.
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I drew this guy to have when it's time to finish the third piece.