His paintings were workmanlike, but skilled -- that is, not flashy like Sargent's. Nor were his subjects usualy major aristocrats, so far as I can tell. And he was little influenced by Modernism, though there are hints of that in some of the images below.
As her extensive Wikipedia entry mentions, she was indeed aristocratic. But she also had a literary life, as did other Strang portrait subjects. Modernist simplification can be seen in this painting, though Vita's face is accurately portrayed.
A more definite literary figure, Masefield was appointed Poet Laureate in 1930.
"Jacky" Fisher was First Sea Lord of the Royal Navy. His major innovations included the creation of battleship Dreadnought, the first all-big-gun ship of its kind, along with the less-successful battlecruiser line.
Not everyone Strang painted was famous.
He also painted upper-middle class genre scenes. Some modernist simplification and flattening are found here, though there is no distortion of the subjects' proportions.
A hugely popular topic for painters for many years.
These are occasional three-day weekends in the United Kingdom.
The man at the right resembles Strang as seen in several of his self-portraits.
No sign of modernist influence here.
Hardy is another important literary subject: biography here. Note the modernist background -- possibly a real painting, but might have been a Strang invention. This is one of his last works.