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This charming 1980s poster is possibly done by Margaret D. H. Keane (1927-2022) or at least its in her signature style.
In the 1960s, Margaret Keane's artwork was sold under the name of her husband, Walter Keane. Why she chose to do so has not been fully explained, but conflict over that issue was cited as one of the reasons they divorced. Neither wanting to relinquish rights to the artwork, Walter and Margaret's divorce proceedings went all the way to Federal court. At the hearing, Margaret created a painting in front of the judge to prove that she was the artist. Walter declined to paint before the court, citing a sore shoulder. In 1986, the courts sided with her, enabling her to paint under her own name.