Henry's pose on the beach after DP goes back into the water reminded me of this:
http://www.art.com/asp/sp-asp/_/pd--11837648/sp--A/Young_Male_Nude_1855.htm
Hippolyte Flandrin's "Young Male Nude."
But the pose also looked like a photo I saw in Andrew Sinclair's biography of Jack London. This photo was taken by London of his friend, the poet George Sterling, and Sterling was shown sitting on a beach, nude, head down, arms in the same position Henry's are.
1 to 4 of 4