From the information I can find, Charles Eyres Simmons was not a member of the Newlyn School. He is mentioned on cornwallartists.org and his paintings were often bought by Americans. Using watercolour, he is my main focus as the man I am looking at, James William Ladner, was a teacher and painted watercolours, to a high amateur level. Both he and Charles Eyres Simmons were of a similar age and living in the Hampton Court/Kingston area. Were they at school together? Eyres Simmons moved to live in Churchtown, Ruan Minor between 1901 and 1911, remaining there until 1938 at least. Churchtown was tiny, only a handful of houses, now demolished. Around 1916, James William Ladner moved to live in Churchtown, Ruan Minor. He took up a teaching role at the school, but also painted. Coincidence?
Another artist, Alfred Joseph Warne Browne, was a member of the Newlyn School and exhibited in London, 15 times at the Royal Academy. He also lived in Ruan Minor, a landscape painter and in the Census it says LEA, which may mean he worked for the Local Education Authority, possibly in a teaching role. But he died a year before the Ladners arrived.
There is very little information regarding these artists. That is why I am asking on RootsChat, to see if anyone can access information not available on the Internet.