Generate a 90's anime-style portrait of a woman with a cheerful expression. She has short, sleek black hair with a natural flow, framing her face softly. Her eyes are a warm and friendly almond shape, conveying a sense of kindness. She's wearing a simple green round-neck top, and her pose is casual, with a relaxed and happy demeanor. The background should be a soft, natural setting that complements her outfit. The overall look should be classic with the typical cell-shaded animation style of the 90's era, capturing the vintage anime charm --s 400 --niji 6