Most of these works, 138 in all, he gave to the British Government. They have simple white frames and are kept together in the Imperial War Museum in London. For his war work, he was made a Knight Commander of the Order of the British Empire (KBE) in the 1918 King's birthday honours list.
Otherwise, Orpen was seen at his best in personal family portraits.
- "Orpen was fond of painting women sitters against a black background, lighting the figure from two sides, an arrangement which gave luminosity and a certain ethereal appearance to his unfaltering but matter of fact statement".
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- "No. 30730". The London Gazette (Supplement). 7 June 1918. pp. 6685–6686.
- Wellington, H.L. (1940). "Orpen, Sir William Newenham Montague (1878 - 1931)". Dictionary of National Biography, 1931-40 suppl. London: Oxford University Press.