How to create this "Agnetha" wallpaper

My third video wallpaper tutorial here. It about the wallpaper above (obviously).
The video is downloadable from the link below:
If you are having issues with watching it online just use:
Everything you need to know is explained in the video, but before you start you will need to get my brushes pack and extract it to ~/.gimp-2.6/brushes:
There should only be files and not folders in that directory!
You will also need to download the image below, which you'll have to use on later stage:
My XCF file can be downloaded from below:
And here is my 1366x768 PNG: