Superimposition…
ALSO... you aren’t using the best image from the film that’s available...
Here’s a higher quality image... at 6:44 in The Lost Bullet
I could see the "face" in your earlier capture.
You don't notice that the left "eye" is on "Stolley's" left cheek?
You claimed this face "superimposition" was in the original Zapruder film. But it doesn't appear on any Zapruder frame. The "superimposition" was created in 2013 when a computer program haphazardly combined two sequential Zapruder frames into one to create an interpolation frame. Such blended frames are used to increase the frame count as the film speed of the Zapruder film (18 fps) differs from the HDTV film speed (greater than 18 fps).
Some people have a knack for spotting something that isn't there. Jack White was like that; he thought the baby in a picture of Marina and Lee was a doll prop. David Lifton spotted a rifleman wearing a German helmet on the knoll. Can't make this stuff up, folks.