Crossing the Line

  • [left]: Illustration The Crew on Board by Henry Holiday to Lewis Carroll’s The Hunting of the Snark (1876)
  • [right]: Crossing the Line (1839), based on a print by Thomas Landseer, after Augustus Earle. You will find the print in Robert Fitz-Roy’s Narrative of the surveying voyages of HMS Adventure and Beagle, Vol II (1839).

This is of of the comparisons where am not so sure whether Holiday alluded to Landseer’s print. If it is, then you might wait a little bit before you look at my spoiler where I marked possible(?) clues given to us by Holiday.
 

2017-11-08, updated: 2019-06-16