Banner for natural food supplement website

Hello designers, I have a website about a certain type of natural food supplement (I'll provide further details to the winning bidder, and I'd like a 1000x150 header banner for it. I am considering either to get the banner done in illustration style (perhaps you'd need Adobe Illustrator?), which means it'll look like a cartoon image, or to get it done using real life imageries. I guess as long as it matches with the theme of the site, it should be fine. Your work should be 100% original, obviously. So in your bid, please mention how much you'd charge for a "regular" (not sure what the proper jargon is) type of banner, and how much you'd charge for an illustration (cartoon) style. Also, please provide some samples of your past work as well. Thanks!