I need advice about my Mix

[kykiles]

Hello,

I'm a begginer in mastering. I need some help. I woulde like to know my mistakes to do the correction...

http://dl.dropbox.com/u/6166770/Chapter IV - Doom (Metal Mix).mp3

Edit: Guitars - preamp + LeCab (impulses), drums - samples, bass - broomstick bass plugin.

thx for help.