What size difference should generally be shown between a child and an adult in a picture?

Correct answer: The adult generally larger

Proportion helps an artist show believable differences between figures. In ordinary comparisons, an adult is generally larger and taller than a child because the adult body has developed further. The word “generally” allows for artistic viewpoint and individual variation; it does not mean every image must use one rigid measurement. Equal size, a child always being larger, or shapeless figures would not communicate the usual age-based relationship.