... and here's what the shot looks like in my bootleg of a 35mm exhibition print from ca. 1981. (Click to view the full image.)
The pinkish sky certainly gives it a "dusk" vibe. I'm not claiming this is correct, but you can at least tell how much of the sky was exposed on film. To me it looks like this was shot on a somewhat overcast day.
(There also seems to be more image on the top compared to the official releases.)
Correct or not, I'm still going with OMEN's grading on this. The pale skintones and bright whites seem more appropriate to the storytelling.