A striking close-up portrait of a demon girl revealing her captivating features, with vibrant blue skin and elegant, lush horns reminiscent of an ethereal oni. Her face exudes a devilish allure, with sharp, defined features characteristic of a cosmic tiefling. Her gaze is intense and enchanting, framed by enigmatic eyes that sparkle like distant galaxies. The horns gracefully arc from her head, adding to her enigmatic presence, while her hair flows around her like a dark, shimmering nebula. The portrait is painted in a style reminiscent of a vivid, otherworldly anime, capturing the mix of beauty and menace, with subtle touches of the mystical energy that surrounds her being, embodying the essence of a character from a Dungeons & Dragons realm.