Aw, this is so nice. I love the birds, it totally brings me to FFX Besaid - which I give major bonus points for, since Besaid is a personal favourite track of mine and holds a special place in my heart.
This one is different in that it's a lot more light-hearted than the original track. Its original feeling is what attracted me to the music to begin with, so I'm quite surprised that I find myself in love with this one. I feel like the original is a great introduction to Final Fantasy X-2's story, and this one suits the end result to it quite well! It's very happy-ending in a bittersweet way. Bitter because the story is over, sweet because it ended in a way that leaves us breathing a relief sigh of "finally". It works with the tragic yet wonderful love story that came with the X series.
Great job :)