Book Cover and some illustrations

Hi, I will be publishing a book in the next few weeks. I am searching for a illustrator for the cover, and maybe for some inside illustrations. The format is A4, it is front, border and back. It is about networking. You will get the text from me, and some barcode. The illustration should also be usable on a landing page of the website! Here are some examples: http://www.amazon.com/Business-Networks-Telecommunications-Edition-Resources/dp/0136100120/ref=sr_1_9?s=books&ie=UTF8&qid=1335543531&sr=1-9 http://www.amazon.com/Network-Information-Theory-Professor-Abbas/dp/1107008735/ref=sr_1_13?s=books&ie=UTF8&qid=1335543574&sr=1-13 http://www.amazon.com/The-Illustrated-Network-Kaufmann-Networking/dp/0123745411/ref=sr_1_63?s=books&ie=UTF8&qid=1335543635&sr=1-63 You will find a style i like with the attachment. IMPORTANT!: If you bid, send me some stuff from your portfolio, which is authentic!