Generate a detailed poster for the children's U-shaped electric toothbrush based on the provided white-background product image. The background is a clear light blue, with vertical water flows and droplets on both sides. On the water surface at the lower center, two identical U-shaped toothbrushes are placed—one mint green and one cream pink. The transparent U-shaped brush head is clearly visible, and the body has fine water droplets. Layout and copy: The top left aligns with two black lines of title: "Worry-free cleaning / No worries about splashes," and two gray-black lines below: "Easily handle daily rinsing, make brushing more comfortable." Leave a safe text area above the product, with natural reflections on the water surface. The product features an oval, rounded body, transparent soft brush heads, and single round buttons for adjustable color and bristle details. The product originally included brand information, so the device only displayed "MOCKUP" and "EMBRACE YOUR BEAUTY, UNLEASH YOUR POWER," with no other logos. The font should be smooth and sans-serif lined, with headings in heavy black and regular descriptions; Smooth edges of water droplets to avoid true waterproof ratings, test parameters, medical commitments, prices, watermarks, or small print.