Masterpiece illustration featuring a low shot closeup of a child sitting on sand with a joyful smile, showcasing a cute face with extremely detailed big blue eyes. The child, with blonde hair in pigtails, is engrossed in building a sandcastle using a colorful plastic bucket. The scene is illuminated by dramatic sunlight, creating a natural lens flare that enhances the beach setting dotted with seashells and traces of sea life. The image is rendered in 16k UHD HDR quality, capturing every detail in vivid clarity. Artistic and creative choices ensure no cloned features or anatomical anomalies, presenting an endearing and realistic portrait of childhood joy.