Create a vertical fantasy anime illustration of a graceful underwater flower-woman standing barefoot on a pale sandy seabed, centered in the composition. She wears a simple satin-white slip dress with thin straps, softly reflective fabric, and a calf-length hem, while her body is enveloped by enormous flowing {argument name="flower petal color" default="pale blush pink"} petals resembling oversized ruffled sea anemone or oyster mushroom petals. The petals form a dramatic headdress and cloak around her, with many fine white vein lines, scalloped edges, translucent layering, and long trailing petal panels spreading across the floor like a gown train. Her face is intentionally hidden by a flat square {argument name="face cover color" default="dusty pink"} censor block placed over the head area. Set the scene in a dreamy underwater garden with soft blue-green water, sunbeams filtering down from above, floating bubbles, tiny glowing jellyfish, and blurred coral and anemone shapes in lavender, blue, and pastel pink in the background. Use delicate painterly rendering, soft gradients, luminous rim light, ethereal pastel colors, elegant fashion-illustration proportions, intricate petal texture, serene magical atmosphere, and high detail.