This would be better on Eb trumpet, it would be a bit more playable then.
I am fine with all the repeats exept the repitioon that starts in bar 13, that section only needs to be played once, twice is too much.
My favourite section is the maestoso at the end, although it tends not to be very fanfare like for most of the piece.
Personally(opinions may differ) I feel that:
-You should continue going down after the D(c in concert pitch) and not jump up to the E after the the C.
-You could give the piano a bit more solo time, and make it a bit more percussive at places.
