A hyper-realistic 4k portrait captures a mysterious woman at the Venetian Carnival, with flowing blond hair cascading down, intricately detailed, wearing an elaborately designed fox mask that features shimmering gold and crimson patterns. The oil painting technique brings out rich textures and a vibrant play of shadows and light across her serene expression, highlighting delicate features and the sumptuous fabrics of her ornately adorned costume, all set against a softly blurred background that hints at the lively ambiance of the carnival.