A stunning portrait of a mysterious woman with long, flowing dark hair, standing against a cosmic, ethereal background. She is wearing a sleek black dress with intricate folds, her back partially exposed, looking over her shoulder with a piercing, enigmatic gaze. The background features abstract celestial elements, such as a glowing halo and sparkling particles, adding an otherworldly atmosphere. The style is hyper-realistic, with a focus on dramatic lighting and fine details.