A character sheet featuring four children, each with distinct characteristics for an interactive children's book. The style is colorful, playful, and designed for a young audience (ages 6-10). Each character should have front, side, and back views, along with a close-up of their faces showing different emotions (happy, surprised, thoughtful, playful). The background should be simple, focusing on the characters. Each character's clothing should be vibrant but not overwhelming, with clear, simple shapes and colors. Below are their descriptions: Martín: A boy with big brown eyes and straight brown hair, wearing a green shirt and blue shorts. His expression is joyful and adventurous. He is holding a red ball. His hair is straight and short, with a few strands slightly messy. Ryu: A mulatto boy with curly black hair, wearing a yellow shirt and brown shorts. His expression is thoughtful but playful, and his hair is tightly coiled. He often has a curious, inquisitive look. Ana: A girl with medium-length brown hair, wearing a pink shirt and a purple skirt. She has a bright smile and is holding a small flower. She should have an expression of happiness and excitement. Darío: An older boy with straight brown hair, wearing a blue shirt and jeans. He looks protective and calm, with a kind expression. He is the tallest of the group and looks like a leader, standing with confidence.