Arrangement is absolutely stellar. I'd love to know what you're using right now for samples; those strings sound incredible.
The female vocals (which I'm assuming are live) mix perfectly into the song. If you're looking for nitpicks, the song seems to lack a bit of high end, especially on the higher strings that make them sound a bit muffled. Not bad by any means, but I noticed it.
Overall though, absolutely fantastic. Your brass and the flute at the beginning and the rolls of the timpani to the build-ups are all just stellar and I've listened to the song three times now. Great job as usual.