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http://www.photomatters.org/light-direction
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http://facialexpressionsproject.tumblr.com/archive
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Anatomy reference for both 2D and 3D. Pose, portrait reference photo as well as texture.
http://www.fineart.sk
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http://fuckyeahglasses.tumblr.com/archive
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http://www.pauldebevec.com/FaceDemo
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http://www.models1.co.uk/results.aspx?nav=0&sexid=2&subid=7770
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http://treijim.deviantart.com/art/Tutorial-Graphite-Portraits-82895664
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http://portraitsfordrawing.tumblr.com/archive
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