Hmm.. i can tell which gradient you used, or thats just the colors lol...
But Like i said... Brushes themselves are from hell.. except splatter you just have to know when to use them.. but when you use brushes try using clipping mask, if you dont know how to do that then use the tut in here:
http://www.gfxvoid.com/forums/showthread.php?t=48830
there's some useful stuff in there.
And your background looks very blurry, try to find some good smudge settings and smudge it around so it doesn't look so bland
But try again with this help and i think it should turn out better