First I have to say that Its not bad for a first attempt.
Now comes the constructive criticism
The glow on the render is bad so just loose that. and the background needs some more work, you should blend the render a little (there are tutorials on that). The text is to big for my taste and you havent done to much with it.
But like i said its not bad for a first attempt.
*Looks at his first sig and cries*