Hey there!
Here's the link for the tutorial:
https://www.yiihuu.cc/c/8296_2670_1038

I've just created a course for Yiihuu where I go through my whole creative process when creating this digital bust.
It ended up being 11 hours long and I feel like I was able to share everything I can think of when doing this type of work. I recorded in english and they will soon publish one with the chinese translation.

If you end up buying this, please let me know what you think!