A detailed portrait of a female demon featuring a striking blue tiefling with celestial features, showcasing lush, elaborate horns reminiscent of the Oni. Her skin glimmers with a mystical sheen, setting her apart in a cosmic realm. The demon girl's face is both haunting and captivating, her eyes swirling like a starry galaxy, embodying the mysterious allure of a tiefling from Dungeons & Dragons. Painted in a style reminiscent of 'Arcane,' this character blends anime influences with vibrant, ethereal colors, capturing the essence of a cosmic entity. Her expression is a mix of enigmatic charm and fierce elegance, making her a compelling figure of otherworldly beauty.