Research on a hyper realism artist

I decided to do some research into other artists that's technique could be useful for me to learn how to improve upon my current character.

https://mymodernmet.com/leng-jun-hyperrelistic-paintings/

https://www.youtube.com/watch?v=1xy6m2bc6lg

I found this article on an artist from China that is known for his hyper realistic paintings of people, called Leng Jun. I watched a video of him live drawing one girl, he began by drawing a faint outline of her, then added the colours that he saw. From watching him work it showed me how he used colour to create different depths within her face, also I saw how he drew hair which is something that I struggle with when drawing characters.