Wow, thats awesome! If you'll ever make a wallpaper sized picture (1024x768 or higher) of this girl, let me know
Btw i'll hijack you're thread to show some more Paint.NET work of my own. It's not on the same detail level as yours (that was not my intention hehe) but is also completely drawn in Paint.NET.
Links under preview images lead to full quality images.
http://www.deviantart.com/deviation/23176048/
http://www.deviantart.com/deviation/23168159/
http://www.deviantart.com/deviation/23240708/
Btw, my avatar is also edited in Paint.NET and also most of graphic elements on my webpages