Start with a subject, not a style
Ask what moment you are preparing: a dinosaur picnic, a family pet, a rocket launch or a favorite place. A specific little scene gives the page more emotional pull than a generic collection of objects.
Match detail to the child
Younger children usually need larger shapes, fewer enclosed regions and strong outlines. Older children can enjoy layered backgrounds, patterns and small visual discoveries. The goal is confidence first, complexity second.
Leave room for their imagination
A good line-art page suggests the world without finishing it for them. Keep the main subject readable, then use a few background details to invite storytelling and color choices.
Make the finished file useful
Choose a page that can be printed at home and also opened in a drawing app. A downloadable result gives the family a choice between paper, pixels or both.