Possibly Sargent had been considering this pose for an unused version of The Judgment

Notes: 

Bibliography

Trevor Fairbrother, John Singer Sargent: the Sensualist (Seattle WA/New Haven CT, 2000), repr. as Folio 27, following p. 180

Trevor Fairbrother, "A Private Album: John Singer Sargent's Studies of Nude Male Models", Arts Magazine, vol. LVI, no. 4, December 1981, p. 76, fig. 11