I would choose the last one if I had to, "Growing Up Together". It really sounds tender, and reflects maybe better than the others what it tries to. The first one, the
love theme, is also good at this point. The "New Life" part begins quite well, I think, but I felt it messing up as it went on. The other two I found weaker than the rest.
I cannot advice you much more precisely, I'd love to have more skill than I do just now on orchestration -I wouldn't dare that sort of group myself by now. Anyway, there's a passage on the last piece (measure 41 and so on) that troubled me. Too dense a texture, I find the octaves on piano's right hand (which I supose are to be heard) quite lost. I wouldn't give the left hand those insistent chords, on mid-low register, save you're looking for a really special effect.
On another matter, if you're considering submitting one of these pieces, I would spend some time tiding up the score
Keep sharing.