After enlargement and going frame by frame, I think I know something of how they did the face effect. Before the transformation, her face was very glossy – as if some gel had been applied to her face… then her close-up scene’s overall lighting shifted and, with that, her face. There may have been some substance underneath (?) the “gel” that only revealed itself based on how it was lit (a colored light?). Also, note that in the post-transformation scenes showing her and the other actors, her face was as before the transformation.
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