About this image via Wikipedia:
A three- quarters length portrait of Corporal J. D. M. Pearson, GC, WAAF (1940) – shows Corporal Daphne Pearson of the Women’s Auxiliary Air Force, WAAF, a recipient of the Empire Gallantry Medal, later exchanged for the George Cross. Although Pearson, at Knight’s insistence, sat for the portrait holding a rifle, the finished painting shows her holding a respirator. As WAAF personal were not allowed to carry arms on duty, Knight had to paint over the rifle. 
Joan Daphne Mary Pearson, GC (25 May 1911 – 25 July 2000) was a Women’s Auxiliary Air Force officer during the Second World War and one of only thirteen women recipients of the George Cross, the highest decoration for gallantry not in the face of an enemy that can, or could, be awarded to a citizen of the United Kingdom or commonwealth.
Pearson joined the Women’s Auxiliary Air Force (WAAF) as a medical orderly shortly after the outbreak of the Second World War in 1939.
In the early hours of the morning on 31 May 1940, Avro Anson bomber R3389 of No. 500 Squadron RAF undershot on approach to an airstrip near the WAAF quarters in Detling, Kent, crashing into a field. Upon landing, a bomb exploded, killing the navigator instantly, and leaving the pilot seriously injured. Corporal Pearson entered the burning fuselage, released the pilot from his harness and removed him from the immediate area around the aircraft. After she was 27 metres (30 yards) from the aircraft, a bomb exploded. She flung herself on top of the pilot to protect him. After medical staff had removed the pilot, she went back to the plane to look for the fourth crew member, the radio operator. She found him dead. For her deeds, Pearson was awarded the Empire Gallantry Medal (EGM). 
About the Artist, via Wikipedia:
Dame Laura Knight, (née Johnson), DBE RA RWS (4 August 1877 – 7 July 1970) was an English artist who worked in oils, watercolors, etching, engraving and drypoint. Knight was a painter in the figurative, realist tradition, who embraced English Impressionism. In her long career, Knight was among the most successful and popular painters in Britain. Her success in the male-dominated British art establishment paved the way for greater status and recognition for women artists.
In 1929 she was created a Dame, and in 1936 became the first woman elected to full membership of the Royal Academy. Her large retrospective exhibition at the Royal Academy in 1965 was the first for a woman. Knight was known for painting amidst the world of the theatre and ballet in London, and for being a war artist during the Second World War. She was also greatly interested in, and inspired by, marginalized communities and individuals, including Gypsies and circus performers. 
Credits and Attributions:
File:Corporal J.D.M Pearson, GC, WAAF (1940) (Art. IWM ART LD 626).jpg|
 Wikipedia contributors, “Laura Knight,” Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Laura_Knight&oldid=1019091508 (accessed April 29, 2021).
 Wikipedia contributors, “Daphne Pearson,” Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/w/index.php?title=Daphne_Pearson&oldid=1000936279 (accessed April 29, 2021).