Create diagrams to help tell the story of our info ebook

I am looking for a freelancer to create diagrams to help tell the story of our info ebook. In particular, we need sketch diagrams, as these best lend themselves to the theme of the ebook. Although we have a rough idea of what we're looking for, we are open to any creative ideas that a freelancer may bring to the table. We will need more than 7 diagrams in total, so please bear this in mind when submitting your bid.

If you could provide us with examples of similar work (not just logos you've designed etc) that'd be great.