A striking close-up of a female tiefling with lush, ornately twisted horns, her skin a deep, cosmic blue with intricate patterns resembling constellations. Her face, both alluring and intimidating, exhibits the sharp, angular features of a demon. Her eyes glow with an otherworldly light, hinting at the mysteries of her dark powers. Her hair flows around her like a nebula, shimmering with hints of purple and silver. The portrait captures her enigmatic beauty and the fierce confidence of a demon girl from the depths of the underworld, painted in a style reminiscent of Arcane with an anime influence. Her oni-esque horns add to her ethereal yet fearsome presence, embodying the essence of a cosmic tiefling from a mythical realm.