Unnecessary gestures? Have you not seen any Lang Lang? He captures everyone with it. It's learning from the best.
As I said I don't think you are playing bad but in my humble opinion you have still a lot to improve. But in my opinion I think you must improve your attitude first and open your mind

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Lang Lang can like you or not, he's not one of my favorites but it's obvious that he have a huge technique control that let him do whatever he wants. In my personal opinion Lang Lang's face gestures are unnecessary in the physical side of playing piano. Maybe they are necessary for him in order to create his image and showmanship or maybe are natural to him, I don't know and I don't think that's important. But while Lang could do one showman gesture, he is doing at the time thousands of technique movements which are necessary to play. These cannot be random, they must be learnt and internalized.
And I don't think imitating or watching pianists on TV is "learning from the best". Mimics are not good. You can learn from the best... teachers and after then been inspired by others playing but always seeking your own ways and personality after you'll get the basis.
My complain about your gestures is that they look aleatory but you are missing some basic technique points like the use of the weight of the arm (I didn't want to talk about this before because I wasn't sure, it's difficult to tell things about technique by watching a video so I may be wrong).
Is there any studies that help towards Liszt Transcendental Etudes no.12 in particular? It's just the cross rhythms from bar 38 - bar 48. then there's 5 against 6, 5 against 4...
Learn the basic technique first. Look for a good teacher. Don't build a house by the roof. Liszt's Preludio can be played even with a not so good technique but Chasse Neige is just another story. If you think that the only difficulty is form bars 38-48 then there's something wrong, you are underestimating the huge difficulties that this etude has.