This may be a basic question, but I've never had a piano teacher so I'm not sure how to finger this circled measure.
My confusion stems from the fact that I remember seeing in arpeggio books that for the flat arpeggios like Eb major, Ab major, etc. that the thumb plays the white key. For example, if you want to arpeggiate the Eb major chord ascending on the left hand, you would use the fingering 3 1 4 2 1 4 2. Please correct me if I am wrong about this.
However, in Japanese music, often I see the third of the chord omitted, and so the regular fingering (at least, the one I've seen in Hanon) doesn't seem to apply. Are there multiple/alternative fingerings for a single arpeggio? What about, for the circled measure, after the octave, 1 2 5, followed by crossing over to 3 2 3 5? Does the adage "whatever feels comfortable" apply here?
Any help is appreciated.