Graphic/Illustration/Sketch for Book

I am looking for a graphic designer or illustrator, who would be able to create a sketch/graphic/illustration for my forthcoming book.

The graphic consists of two circles (one inside the others). The internal circle is divided into three parts and the external circle is divided into six parts. Each of the parts has a title/name inside. The image should be produced in black/white (gray scales) for the book. I do not want a regular computer graphic but would prefer something that looks like a pencil drawing made by hand. I will share my draft of the graphic and specific design ideas with the winning bidder.

The file should ideally be provided in .jpg. The resolution of the image should be no less than 300 dots per inch (or 118 pixels per cm).

Please send a sample of your prior work when bidding and state if you are happy to make changes to the design. I prefer fixed price bids. I would require the graphic by 18 April 2012.