Recently watched: Poison for the Fairies (Veneno para las hadas), 1984; Spanish with English subtitles.
Horror in the same way that Heavenly Creatures is horror, and it reminds me a little of that movie, without the overt sexuality.
Orphaned Veronica lives with her invalid grandmother and a caretaker. Flavia, the daughter of rich, intellectually sophisticated parents, is a new arrival at Veronica’s school. Veronica pretends to be (or perhaps believes she is) a witch. Helped along by a coincidence or two, she convinces Flavia, and proceeds to manipulate her in increasingly sinister ways.
The main characters are children, and while adults play significant roles in the story, we rarely see their faces: they’re shown from behind, or from below the neck, or as silhouettes in the dark. The few exceptions are for effect, as when we see the face of Flavia’s piano teacher only after she dies.
I don’t know that I’d call this movie scary, but it is interesting, and worth a watch.