I love Jack's face, in every scene it steals the show.
But the best scene to show off that face, is the one where Ennis is pouting on the side of the hill because they have to go, and Jack picks up his lassoo.
Jack steps into closeup, and there is that face expressing care, concern and love.
He wonders how he can extend their time together, now that Aguirre has decided to bring them down from the mountain.
Will Ennis choose him or Alma?
There is so much love and desire in that face.
edit - added ing to express
try to replace brightened image