Not bad, Iris
This is one of the better quality movies I've seen in a while, and it only helps that the music is petty good. However, that only means I get to criticize you on some higher-tier details. Don't get me wrong, you did a lot of things right in this movie, but there are some little things I noticed. When she's running, her body stays level. If you watch a real person, they move up and down a little as they jog, and it almost made the intro feel weak, breaking the sense of disbelief before people even began getting into it.
The other thing I noticed was that you reused some of the shots. I keep grilling people about this, and reminding them that it's never a good idea to do that, even if it's an identical part of the song. You changed that near the end, though, at least. One thing I can't complain about, though, is the graphics; they're stunning, especially the deserted room she's sitting in. The bottom line is that this is a great animation, and you're well on your way to perfecting the craft.