Hi! I think this is a very cute trio! My favourite part are the introduction b.45-46-47.
I think that, to emphasize the melody in 21 (as it is mid register), maybe you can do a variation of the main theme with a larger register, not just a 6th, also, the flute could double the melody an octave higher (like b.24) so you break the accompaniment pattern!
Overall, i liked it a lot!!!!!!😀