The fluidity of the music. The thematic development here was nothing short of masterful, with themes reemerging in new textures, rhythms, dynamics, voices. There was never a dull moment. Predictability was perfectly balanced with the unknown.
I didn't objectively dislike anything about this piece. What I found myself wishing for, however, was more adventurous harmony. For the most part, we stayed within the chord degrees of any given scale (F minor, C major, etc.), with a notable exception being the "Meno mosso con abbandono" section (fabulous, that). The traditional harmonies you employed were not detrimental to your piece overall, however; it just happened to be what I dislike the most.
My favorite theme emerged at m. 109. It has a distinct freshness to it, unmuddied by all the bass chords the other themes tended to have. If I were forced to choose a least favorite, I suppose I would say the opening theme because of the aforementioned muddiness. But I still enjoyed the theme.
No problems with the engraving here. Although I did notice an expression text ("delicato") sneak above the staff at m. 61. (I am now certain that you are rather fond of expression texts smattered throughout your score.) Perhaps some suggested fingering at m. 57-58 would be helpful. I personally do not think three staves was ever necessary.
Oh, and there is a random "molto" at m. 56 — not sure what it's supposed to be modifying.
Not even a little bit.
These are, of course, relative terms, and the whole piece was relatively consonant. Still, for the Romantic idiom in which you wrote, much more dissonance would've ruined the idiom; therefore, I would say that the balance you struck worked very well for this piece.
I thought it was well-placed. No complaints.
It's obvious you play piano and are very good at it. This has translated over into your compositional abilities for the instrument. The writing here is perfectly idiomatic for piano, quite successfully done in the idiom you chose. Personally, however, I am wary of pieces that are melodically right-hand-heavy (and a reason I have a problem with Chopin). I'd like to see a piece that is a little more balanced in sharing melodic material between the hands.
Once upon a time, I listened to Chopin. And I won't even pretend to know what the ballade form is.
Decidedly Chopin, maybe a touch of Lizst.
Leave Romanticism in the 19th century. You have a strong grasp of how music fits together; I encourage you to explore non-tertian harmonies and non-diatonic scales. They may sound terrible at first, but I think, little by little, you'll find how you can incorporate bits of them without compromising the style you're going for.
The important thing is that you write music you like. It may very well be possible that Romanticism is where your composer's heart is and you'll never leave it. That's perfectly fine. My suggestion is still to explore a little, expand your palette, stretch yourself.
That said, this is a beautiful piece of music — one that I think would fit well in the concert pianist's repertoire. Keep up the good work!