Check this video out at Hi-Res here: http://www.tutvid.com/tutorials/illustrator/tutorials/vectorAnEye.php
In this video will take vector the eye of a model in Illustrator using some techniques that will be useful in not only vectoring eyes but tracing techniques that are used for full face and body vectoring and vexeling. Please check out http://www.tutvid.com for more free videos and downloads!
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