Challenges of the week give artists the opportunity to create new and fantastic art based on a weekly theme set by the challenge moderators. They are also a great place to develop core skills.
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http://www.youtube.com/watch?v=5T8DH2miUlUSimilar ThreadsArt: Inspired by scott robertsonSketchBook: Environments via Scott Robertson's Technique Interview with Scott Robertson Scott Robertson & Spyhunter
Learning to see
"...the ideas are what matter most" Doug Chiang