Create a stunning, high-resolution image of a 17-year-old version of Disney's Little Mermaid, Ariel. Show her in a graceful swimming pose with a vibrant under-the-sea background. Capture every detail in 16k UHD quality with HDR, ensuring vivid colors and clarity. Retain Ariel's signature red hair and mermaid tail, presenting her in a refined, tasteful manner that aligns with her character's timeless charm. Focus on the beauty and harmony of the scene, avoiding any distortions or imperfections. Ensure the image is crisp and clear, free from any visual distractions such as low resolution, blurriness, or unwanted artifacts. Keep the composition intact, highlighting Ariel's enchanting presence beneath the waves.