This is really good! I agree with what has been said about your melody writing, especially regarding the English horn solos, they are really nice! I also really like the horn melody at F.
A couple of things I noticed:
The English horn appears to be written in the wrong key signature at the beginning. Since it is a transposing instrument in F in should be written in A minor, not D minor. Interestingly enough, the written pitches are transposed correctly (the written G sounds like a C). I think maybe Musescore is not accounting for the instrument change properly? The same thing happens thing happens when you switch back to the Oboe at m83 - the oboe should be written in D major.
Is there any reason you left the horns out of the fast sixteenth notes in the Allegro section? I think if they played with the trumpets it might fill out the sound more.
I think the bass trombone might have trouble tonguing that fast on the G in the Allegro section, since it’s somewhat of a low note, especially at a ff dynamic. Can any trombone players confirm?
On the sixteenth note runs in the Allegro section, I noticed Vln II is playing continuously. Maybe give some of their lines to the cello (m46-47, m50-51 for example) so they have time to rest?
I think the orchestration at H is a little light. It’s a really big moment, and I don’t think there is enough harmonic support underneath the melody. What I might do is give the clarinet part to the horns (since they’re currently not playing), then have the clarinets double the oboes. The horns will provide a much more solid harmonic backbone, and the clarinets will give more woodwind color to the string melody.
Thank you for sharing! It’s a really enjoyable piece. It’s unfortunate that you didn’t win, but hopefully you are able to expand it into a symphony and submit next year and win 😉