Masterpiece illustration of a young child sitting on the sand with a joyful smile and cute face, captured in a low shot closeup. The child has extremely detailed big blue eyes and playful pigtails with blonde hair, engaged in building a sandcastle using a colorful plastic bucket. The scene is bathed in dramatic lighting, with sunlight creating a lens flare effect. A picturesque beach setting surrounds them, featuring scattered shells and hints of sea life. Rendered in 16k UHD HDR, ensuring a high level of detail and vivid colors, avoiding any cloning or distortions, with a focus on a natural appearance.