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https://www.youtube.com/watch?v=7dWcW3OAABs
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http://www.elfwood.com/farp/metal2/Reflective0.htm
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http://ronlemen.blogspot.de
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http://navate.deviantart.com/art/SKIN-a-tutorial-Part-2-145159387
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http://fox-orian.deviantart.com/art/Perspective-Composition-Pt-2-125042592
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https://www.youtube.com/user/digitalbobert
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http://www.conceptart.org/forums/show...olour-Tutorial-Mini-tut-BIG-download!
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https://archive.org/search.php?query=...ect%3A%22The%20Joy%20of%20Painting%22
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https://www.khanacademy.org/test-prep...ion/v/specular-and-diffuse-reflection
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http://www.conceptart.org/forums/show...-Painting-Tutorial-4-fun-Corey-Loving
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