Pownall was born in Leigh in Lancashire in 1862. In the 1890s she was living in Birkenhead. She studied in Frankfurt in 1896 and in Paris from 1897 to 1898 where she was taught by Jean-Baptiste Champeil and Denis Puech. She was also tutored by Auguste Rodin. Pownall exhibited at the Paris Salon from 1893 to 1999 and received an honourable mention for her work at the 1899 Exposition Universelle. She then studied in Rome from 1898 to 1901. In Rome she lived at 53b Via Margutta. Between 1897 and 1925 she regularly showed pieces at the Royal Academy in London.
In 1902 she married Alfred Bromet, a barrister, but she continued to use her maiden name for her work. From 1903 to 1931 they lived at Lime Lodge, Pinner Road in Watford. Pownall was elected an associate member of the Royal Society of British Artists in 1932. In 1935 she wrote an illustrated autobiography, "Response", under the name Mary Pownall Bromet. She died in Oxhey in Hertfordshire on 25 February 1937.
- Edward Villiers, 5th Earl of Clarendon (c.1900) first mayor of Watford
- The Harpy Celaeno, Kelvingrove Art Gallery (1902)
- Love or Money (1906)
- An Intruder (1906)
- The Great Specialist (1907)
- A Ragamuffin (1907)
- A Bolshevik Communist (1923)
- An Aviator (c.1925)
- Ralph Edward Thorpe (1927) second mayor of Watford
- Three bronze figures for the Watford Peace Memorial, Watford Town Hall (unveiled 1928 at the Peace Memorial Hospital)
- Politics (1931)
- Acquedotts Claudio, Roma
- A Sunbeam
- The Kiss
- A La Recherche de la Brebis Perdu
- Maiden Meditation
- Watford Observer: treasures of Watford Museum's storeroom
- Benezit Dictionary of Artists Volume 11 Pinchon-Rouck. Editions Grund, Paris. 2006. ISBN 2 7000 3081 8.
- Mary Pownall (Bromet), Gla.ac.uk, Retrieved 1 October 2016
- James Mackay (1977). The Dictionary of Western Sculptors in Bronze. Antique Collectors' Club. ISBN 0902028553.
- Response. An autobiography. With reproductions of sculpture by the author, Mary Pownall Bromet, 1935
- "Bonhams : Mary Pownall Bromet, British (exh. 1889-1932): A bronze figure of Edward Hyde Villiers, 5th Earl of Clarendon". Retrieved 20 January 2017.
- "Bonhams : Mary Pownall Bromet (Exh 1889-1932) An Aviator 77.5 cm. (30 1/2 in.) high (including verde antico marble base)". Retrieved 20 January 2017.
- firstname.lastname@example.org, Watford Museum, Watford, Hertfordshire, UK. "Watford Museum's website: Mary Bromet 'Aldenham Ralph Alfred Thorpe' sculpture from the Watford Museum Collection of Fine Art". Archived from the original on 1 July 2016. Retrieved 20 January 2017.
- Watford and South West Herts in the Great War, Eugenia and Quintin Russell
- Pauline Rose (23 November 2020). "A look at Britain's neglected professional women sculptors". Art UK. Retrieved 23 November 2021.
- "Mary Pownall (Bromet) - Mapping the Practice and Profession of Sculpture in Britain and Ireland 1851-1951". Retrieved 20 January 2017.