[4] Beaton became a role model for the young Mary and she persuaded her Armour's father to allow her to enrol at Glasgow School of Art, where she studied from 1920 until 1925.
[3][5] In 1927 she married the landscape and figure painter William Armour (1903–1979), settling in Milngavie on the outskirts of Glasgow city.
[1] Her marriage resulted in her resigning her teaching post as required under the education authority rules for married women.
After the Education Authority legislation for married women had been repealed, Armour returned to teaching still life painting at Glasgow School of Art from 1951 to 1962.
[6] Armour learned from her contemporaries such as Anne Redpath and her close friend David Donaldson, and Still Life with Pomegranate is a fine example of her paintings of the late 1940s.
[6] During Armour's teaching at the Glasgow School of Art in the 1950s, she claimed to had learnt much from her students and their response to contemporary painting.