I am by no means an expert on technique, but here are some things that I think you could work on.
-sit closer to the piano. It looks like you are having to lean in too far, which is making your back and neck too tense. You should be sitting up straight, not leaning in.
-Don't use so much pedal! It sounds a bit muddy with the amount of pedal you are using. Make sure you clear it at every harmony change/every measure. Crispness is key for the Arietta.
-especially during that high section: make sure the right and left hands are in sync. Practice this section more! Split it into 4 measure sections and practice each one at least 10 times SLOWLY everyday until you get it right. Slowness is very key. Gradually speed it up, using a metronome. If you don't have one, you can google the word "metronome" and use your phone as one.
Op. 111 is a very difficult piece, technically and musically. Just curious, if your technique is, as you say, "faulty" why did you choose to play this piece? Do you think you are ready for it? What has your previous repertoire been?