In this tutorial, you'll learn how to create an illustration of a model. We'll be creating it in vector style, though using Photoshops Burn Tool to add some dimensionality to the illustration. By the end you'll have enough information and practice to create your own. Although, it doesn't require any special ability you should be proficient in the use of the Pen Tool. Drawing skills would also help, as well as a tablet, though it's not necessary.
LINK:
http://psdtuts.com/drawing/create-a-vector-style-illustration-in-photoshop/