What Makes a Great Children’s Book Illustration?

Hey everyone! I’m currently exploring the world of children’s book illustration and would love to hear your thoughts. What, in your opinion, makes an illustration truly stand out in a children’s book? Is it the color palette, the expressiveness of characters, or the ability to convey emotion and movement? I’m especially interested in styles that both captivate kids and support the story. Share your favorite illustrators or books if you have any!