I used to use pivot, (look at my avatar lol) Go to http://www.darkdemon.org/ It's basicly a giant pivot group. You join and make a thread with your animations in it. (mines http://www.darkdemon.org/viewtopic.php?t=15200) People comment on them and recommend ways to improve. They are experts at pivot and give really good advice so gradually you get much better. Just look at my oldest animations then my newest ones lol! You'll see the difference.