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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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If you haven't heard "The Peacekeepers'", a DCUO guild, is having a contest to not only receive epic comic style art but to also help promote artist who enjoy drawing comic style art.
Here are a couple of links that will be helpful to those who would like to participate:
Hope to see some you join in the fun!