I have kept thinking about this question for days. While I am reading the short story, I envision how in reality Ennis and Jack look like.
There is no doubt that Heath and Jack are beautiful to look at and their actings are excellent and certainly I am not complaining. As I read the story, I tried to pick up every details about them and envision how they look like and act apart from the movie. Somehow, Heath and Jake are not the ones I have in mind.
First - here are some details about Ennis and Jack from the story.
"At first glance Jack seemed fair enought with his curly hair and quick laugh, but for a small man he carried some weight in the haunch and his smile disclosed buckteeth, not pronounced enough to let him eat popcorn out of the neck of a jug, but noticeable."
"Ennis, high-arched nose and narrow face, was scruffy and a little cave-chested, balanced a small torso on long, caliper legs, possessed a muscular and supple body made for the horse and for fighting. His reflexes were uncommonly quick and he was farsighted enough to dislike reading anything except Hamley's saddle catalog."
Also, the passage at the beginning is one of my favorite.
"Ennis Del Mar wakes before five, wind rocking the trailer, hissing in around the aluminum door and window frames. The shirts hanging on a nail shudder slightly in the draft. He gets up, scratching the grey wedge of belly and pubic hair, shuffles to the gas burner, pours leftover coffee in a chipped enamel pan; the flame swathes it in blue. He turns on the tap and urinates in the sink, pulls on his shirt and jeans, his worn boots, stamping the heels against the floor to get them full on. The wind booms down the curved length of the trailer and under its roaring passage he can hear the scratching of fine gravel and sand. It could be bad on the highway with the horse trailer. He has to be packed and away from the place that morning. Again the ranch is on the market and they've shipped out the last of the horses, paid everybody off the day before, the owner saying, "Give em to the real estate shark, I'm out a here," dropping the keys in Ennis's hand. He might have to stay with his married daughter until he picks up another job, yet he is suffused with a sense of pleasure because Jack Twist was in his dream.
The stale coffee is boiling up but he catches it before it goes over the side, pours it into a stained cup and blows on the black liquid, lets a panel of the dream slide forward. If he does not force his attention on it, it might stoke the day, rewarm that old, cold time on the mountain when they owned the world and nothing seemed wrong. The wind strikes the trailer like a load of dirt coming off a dump truck, eases, dies, leaves a temporary silence."
I wonder if Heath and Jake are the ones you would envision from reading the short story. The more I read the story, the more I don't want them to look like Heath and Jake. Strange, huh?