Illustrations/marker visuals for a children's book

I have a 24 page children's book that I need some marker visuals for, to show the content and viewpoint of the illustrations which will then be created at a later date.

There will be 8 small (half page or smaller) visuals and 9 large (full page or DPS) visuals to create. I have basic written descriptions of the content for each and the finished book size is 210mm square.

At this stage, I am only looking for scamp type visuals and not finished illustrations, although I will also be looking at illustrative styles, so you must have some examples of children's book illustrations as part of your portfolio.