From a listener's perspective, it's flawless, but from a critic's perspective, I'd like to make a few suggestions. Namely, is the realism. I'm not terribly concerned about this, as it doesn't effect the sound of the song at all, but if you ever wanted this played live, it would be fatal. Bell ensembles usually stick to a few notes, yet there are quite a few key changes, and this could lead to the need of an unrealistically large ensemble. Also, in terms of parts, i feel the harp may feel a little left out. The harp is stuck playing arpeggios for the entire piece, and I thing a harpist would appreciate something that resembles the beautiful melody you've created. Also, towards the end, I hate the fadeout! It needs a solid ending! This song is far too well-structured to end with a fadeout! I personally think the F that the higher strings are holding should resolve to an Eb at the very last couple measures, and then you should end on a F major chord.
I don't meant to write it for you, because this is beyond my level of compositional prowess, but those are just a couple things i had to mention in hopes you could work on it.