In 1914 he married Anaïs Folin, but met 16-year-old model Kathleen Woodward in 1928 who eventually became his mistress and, following his 1940 divorce, his second wife. Brockhurst renamed her for his purposes Kathleen Dorette -- the golden girl.
The first link above mentions that he received a traveling scholarship to France and Italy in 1913 and was inspired by Italian Renaissance portraiture. That is why many of his portraits include bits of landscapes in the background. That might also have to do with the smooth, highly finished treatment of the faces of his subjects in such portraits.
This might be his first wife, but not painted in the Italian style mentioned above.
Again, perhaps his wife, now with a landscape background.
His wife again, in a very Renaissance manner that includes her costume. This might have been painted in the late 1920s when "Dorette" was entering the scene -- note that the background appears unfinished, though the painting is signed.
The second link above mentions that this painting created a sensation at a 1933 Royal Academy exhibit.
During the mid-1930s the fashion was plucked eyebrows replaced by penciled lines. Which is why Dorette's eyebrows differ from painting to painting.
Perhaps the best-known Dorette painting.
Dorette again, this time with natural eyebrows.