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Prince Andrei, here is a picture of an IEI-Fe whom I know, to help you with VI. She's incredibly intelligent and can't find a man who will date her twice (because she hasn't met a really smart SLE-Ti yet.) I've known her for ten years and we've dated enough (platonically) so that I am 100% sure that she is IEI-Fe.
https://imgur.com/a/7w41r51
Notice her eyes. They are very caring eyes. (IEIs have 4D Fi.) She is sympathetic but not weak. The last time I saw her I was coughing and she made me a cup of some special tea that she had. She's like a Valkyrie. "Here is a potion, my warrior, to restore your strength. Because you need to be strong for me."
Her smile is very Fe, though. Very open, very much for other people, very much for a crowd. Compare her picture to that of the woman in the first picture you posted. Your friend's sister is giving a smile meant only for the viewer, meant only for one. Which is very much Valued Fi.