<b>William Orpen</b> 
 (1878–1931)
 

Major Sir William Newenham Montague Orpen, KBE, RA, RHA was an Irish artist who mainly worked in London. Orpen was a fine draughtsman and a popular, commercially successful painter of portraits for the well-to-do in Edwardian society, though many of his most striking paintings are self-portraits. 

https://en.wikipedia.org/wiki/William_Orpen

Ready To Start. Self Portrait, 1917
1917
Oil on canvas
49 x 60 cm
Imperial War Museums, London, United Kingdom
https://www.iwm.org.uk/collections/item/object/20758

 Painted shortly after his arrival in France, Orpen is inspecting himself in the mirror wearing his military uniform. In a wonderfully revealing self-portrait, he sets out an artistic agenda of colour, pattern, light and texture and a social agenda of drink and sensuality that were to be fulfilled during his time in France.