illustrate (something) with (something)
To add something, typically a picture, to something else (such as a book or instructional text), as to depict or further explain something. I need someone who can illustrate the manual with diagrams of how the machinery works. That kids' book is illustrated with the cutest cartoon bunnies!
illustrate something with something
1. to provide pictorial examples for a book or other document. She illustrated her book with clever line drawings. We need someone to illustrate this book with drawings.
2. Fig. to use something to show how something works, how something is meant to be, or how to do something. Would you please illustrate how to do it with a drawing or two? I think I can illustrate what I mean with a little more explanation.