Well,it could be a lot better but considering you are a beginner and this tut is for more advanced users it's pretty good try...
Some points though...those things that were supposed to create the effects,I don't know exactly how you did that but it's like you sucked the life out of them(I mean those things in front of her hand)...
Also the road and the girl are too monotone,the road is like cropped and pasted and something's wrong with the girl's color,unsuccessful gradient mapping I guess...
But as I said it's a nice try.
I would suggest you try some more beginner tutorials-you can find plenty on deviantart and other graphics sites that will help you improve one step at a time...