Masterpiece illustration showcasing a low shot, closeup of a child sitting on sand with a cheerful and cute expression. The child has extreme detailed big eyes and blonde pigtails, focused on building a sandcastle with a plastic bucket. The scene is illuminated by dramatic sunlight, creating a lens flare effect, against a backdrop of a beach filled with shells and sea life. The image is depicted in 16k UHD HDR quality, emphasizing the joy of the moment.