Create a stunning book cover for \"The Magical Journey of Luna the Mer

Create a stunning book cover for \"The Magical Journey of Luna the Mermaid.\" The cover features Luna, a beautiful mermaid with flowing, iridescent hair and a sparkling tail, swimming through an underwater world filled with vibrant coral reefs, playful dolphins, and glimmering treasure detaileds. She holds a glowing pearl that illuminates the scene with a magical light. The background showcases an enchanting underwater castle in the distance. The title is written in elegant, shimmering letters at the top, surrounded by bubbles and marine motifs, inviting readers to dive into Lunas enchanting adventures.