Get a clue about light & shade, Rembrandt
The main light source comes from Oswald's right
Thus the left side of his face is largely in shadow and cast shadows
Well I'll just Swanee there Di Vinci. Aren't you clever? Obtain a hint on retouching.
So what we had... was a totally incompetent photographer and that shadow just happened to create a perfect line right down the neck. Also, that photograph was retouched and retouched again.
Then, it was colorized [retouching it once more]
Moving on with the Oswald photos....
Picasso out there? What do you say?...same guys? If so, Oswald looked younger in 1961 than he did in 1958.