Fry's work, Camel and nude, for some reason, caught my eye first of these. It is oil and dry pigment on paper. As I looked at this I have a difficulty explaining what it is about it that is so inspiring. Many of the artist's other works are more detailed and more realistic in style. He is a British painter, born in 1927 into a well-known Quaker family. He has been a professor and his work has been exhibited widely since the 1950s. You can see more of his paintings HERE (via the BBC).
Even Nicholson's detail looks scant in comparison to Chamberlain's Oak and brambles. This oil on canvas work uses a great deal of paint and you can see this even in the photograph below. It almost seems like a carving. It is masterful. Chamberlain was born in Yorkshire in 1968. He attended Newcastle University.