Marriage is forever, even after divorce. So it seems for Sarah, a young widow, and Richard, an ambitious artist, who each in their own different ways remain unduly influenced by past marriages. For Richard it's all about nostalgia, for Sarah it's all about fear. Portrait tells the story of Sarah becoming Richard's muse, the entry of the portrait he paints into the Archibald prize, and the dramatic outcome its media attention brings to Sarah's everyday life.