My greatest criticism is that you didn't cite the source of the tune, "Nausicaa of the Valley of the Wind." The title itself, "Requiem", is too generic to identify the source from.
My second criticism is that there is too much reverb. The reverb tail is muddying up the track.
That aside, I think you did quite well. The orchestral instruments all blend together quite well. The harp sounds a bit odd, though. I've never found a harp soundfont that satisfied my vision for an orchestral track.