The beauty in the composition is overshadowed by the quality in your sounds. I know how much you like your soundfonts, but I almost think you need to find something better for this song. Either that or run a channel for all sorts of different string instruments and make your ensemble manually.
Your piano work is good as always, but I think you might find that throwing 2 additional layers (1 staccato and 1 a slightly fuller sound) then eqing the combined 3 of them down to slightly above what we get here would work really well.
Flutes until 33 were amazing, but I think after that 4th note you should bring it up to a higher note. I.e. If you currently have C-E-D-C (long note), try doing it C-E-D-C (long note) G (halfway through the C). Whatever the flute note at 36 and 41 seconds is, it sounded slightly off to me, but this may again be due to the quality of instruments you have.
As I told you on MSN, it sounds like the flute player s dieing at 47 seconds. Get that digital player a crash cart, stat!
Get some wind chimes into the end of this man, they'll sound amazing.
Also, if possible, I think a solo, muted trumpet playing a few long notes every 8 measures or so would do wonders.
As Gravey suggested, percussion would be nice with this. But no kits. A combination of timps, soft crashes and even the sound of a heart beat if you can emulate that.
Finally, the cello. Could be a bit bigger, with a darker sound. See if you can put another cello in an octave below that at about 85% the volume. Think that would be great
Hope these ideas help