Uma sereia sentada, pensativa, numa costa rochosa

A fantasy digital illustration of an adult mermaid seated on a rocky shoreline, positioned prominently on the right side of the frame. She has a slender, athletic build, fair skin, long flowing dark hair decorated with a small pink flower, and a calm, thoughtful expression as she gazes toward the left. Wearing a blue seashell-style top, she sits upright with her torso angled slightly left, one hand braced behind her on the rocks; her shimmering turquoise, scale-patterned tail bends across the foreground and ends in a purple fin near the lower-left edge. In the middle distance, a dark gray naval ship cuts through choppy blue water from left to right, throwing up white spray. A dramatic castle rises on a rocky island behind the mermaid, partly veiled by clouds and dark smoke. Waves crash against the rocks, with bright cyan highlights and crisp splashes. The wide composition balances the mermaid, ship, and castle beneath a luminous blue sky, combining cinematic fantasy realism, detailed textures, and an adventurous, atmospheric mood.