Splash:
Was looking back at previous threads and saw that I missed your post asking about the vertical line on the left man's face.
If you are speaking of the vertical line running down his cheek, it looks like a combination of the way the sun/shading is mixed on his face and the limitations imposed by the resolution of the photo. The sun is hitting on the side of the face, but as the face curves around towards the front, the sun is blocked . Somewhat similar to the terminator effect on the earth as you reach the boundry between day and night. It appears to me that the digital limitations of the photo itself create what appears to be a distinct break between light and dark areas, something that in real life would be a much smoother transition.
Take Care