In the article that someone else linked in this thread, there are JPEG artifacts around the face of the man standing to the left of the car while the one in the post doesn’t have those features. It’s possible that it was run through some sort of upscaling tool and that’s what you’re picking up on.

Edit: After comparing the two photos in more detail, though the compression artifacts differ between the two images somewhat, they are present in both.

Nonetheless, there are numerous fine details in both versions that both seem a bit off from what I would expect.

If anything, this may be the result of this photo being taken in black and white and retroactively colorized. This possibility is ultimately contingent on whether it would be likely for the sort of person who took this photo to have access to color cameras.

Edit 2: The cropped sections of the photo you shared look like brushstrokes to me.