Considering you're about 11(?), it was not a bad animation. I saw one of your previous animations as well, and I can tell that you're definitely working very hard to improve. In terms of the drawings themselves, I think one of the reasons some of them looked odd, besides just needing more practice, was that the straight lines you used looked really out of place. I don't know, they looked way too precise next to the rest of your pictures. For instance, I know water is really hard to draw, but the lines made Styx look like a rug.
Like other reviewers, I thought the voice acting needed improvement, especially Hades'. I think you tried a little too hard to make him sound creepy, and he ended up being really hard to understand.
Just curious, I saw another submission in the Portal for Animation11, and it was about the poem Jabberwocky. Were you all supposed to do an animation on literature?
Anyway I like that Hades grabbed Persephone by the hair. It's a very God of the Underworld thing to do. Plus, this is one of my favorite stories from Greek Mythology.