Help with shading

Hey guys, would one of you talented individuals help me with this.
I’m following a tutorial on create a free form logo which can be seen here.
http://www.purephotoshop.com/view.php?id=70&title=FreeForm%20Interface

Now I can’t get my shading to look anything like his. I know they went over the shading process more then once, that’s understood. However, it seems I am way way off. I attached a zip file. One has no shading, and one has my sad attempt. Maybe someone can give me some advise or create an example or anything.

Couldn’t attach file here it is.
http://www.digitalosophy.com/logo.zip

Thanks a bunch