Here is a portrait of Leonidas Paul Lambrinudi (1916-1943).  He was admitted to Westminster School in London in September 1929 and later attended Athens University.  He joined the Greek Navy in World War II and was lost in action on the RNH Katsonis in September 1943.  The portrait was presented by the Lambrinudi family to the Westminster School, London, in the 1980s and is now in the Drawing Room section of the School's Library.  The information I found about the portrait did not give a date, but I would guess the subject's age to be about 10, so perhaps it was painted circa 1926? 
 
 

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• See more on Philip Alexius de Laszlo