The eyes have it.
I am reminded of Dorothea Lange's "Damaged Child" (1936).
More than one novelist has noted that the eyes of a masked child can be unsettling. (One example: John Le Carre in "A Perfect Spy", when describing the look on Rickie Pym's face when he is cornered and dangerous. The eyes "regret your decisions and note your mortality" - I may have misquoted from memory. Still gives me the chills.)