Yo Gonxalo!
You're amv is not that bad but it's pretty boring because of few mistakes you did:
- Your choice of clip is not always very good.
- Your sync is not strict enough
-You don't follow the rythm of your music, when the music becomes stronger you have to show it with your editing and your choice of clip.
- Your glow FX and your blur FX are not well managed, try to improve your skill on them by watching other (good) amv and trying different settings.
Good luck for your next amv!