The artist describes it as a collection of tips rather than a strict tutorial, as this documentation also comes with some basics of XGen and a video demonstration of Valeria's most used GS CurveTools features, making it a really valuable source of information for beginner artists.
Valeria also announced that there will be a follow-up tutorial soon, covering the making of curly hair and adding some other helpful tips.
In the meantime, check out this beautiful braided real-time hairstyle made by Maksot Sadykov with Maya, XGen, and the GS CurveTools plug-in as well: