Here are my thoughts on this technique HT and Inart are using. They have a certain “look” to them being wool.
The hair styles they chose allow the wool be loose and not under tension at the root, makes sense for the material. If it’s an updo style, hair near the scalp has to be pulled back putting it under stress or it will sag and lose the shape. We’ve seen gel being used to keep the shape at the root but will look clumpy.
What’s interesting is Inart will do Legolas, his hair is pulled back at the top. Will they make it all wool or let it be sculpted at the top and only use wool for the free flowing parts? That’s what I want to know as it will open up doors for more possibilities with similar hair styles like Qui Gon and Last Jedi Rey. The hairstyle has to lend itself to the medium for their techniques to work.