Live Stream Screenshot with Celebrity

9:16 aspect ratio, generate a screenshot of a Douyin live stream featuring {argument name="character" default="Liu Yifei"}. She is holding a sign that says "{argument name="sign text" default="Live tonight, welcome to chat with Yifei!"}"

9:16 的图片比例，生成一张抖音直播的截图，里面是 {argument name="人物" default="刘亦菲"} 在直播，{argument name="人物" default="刘亦菲"} 手里拿着牌子，牌子里写着 {argument name="牌子文字" default="今晚直播，欢迎来参亦菲畅聊！"}