Ultimate Connect the dots book.

Hello! I am wanting to create connect the dots book for kids however I have a bit of a twist. I want the dots colored so when the kids fill in the dots with a colored pencil or a marker so it creates and colors the picture. I have a link of a book that does this. (https://a.co/d/g1wxQAh) the book in the link is for adults. I thought it was pretty cool and kids may really enjoy this type of a book. I am wanting about 300-500 dots per illustration. It needs to be challenging enough for a 8-12 year old but still needs to make sense as an illustration. As a part of the project I will need 35 connect the dot illustrations along with a cover, title page, and A+ content. Attached is an example of a previous illustrator who was unable to finish the project.