Illustration：A boy and a girl observing a frog through a magnifying glass

illustration：A boy and a girl observing a frog through a magnifying glass, ??书籍illustration, ??书籍illustration, ??书籍illustration, ??书籍illustration, colorful ??书籍illustration, ??书籍illustration, Children's illustrations, ??书籍illustration, 故事书illustration, Children's illustrations, ??illustration, 可爱的故事书illustration, Children's illustrations, 可爱的illustration