Good to see high quality articles gaining traction.
If the article looks too verbose, be sure to check out, as the author cites, Inigo Quilez's videos
Painting a Landscape with Maths - https://www.youtube.com/watch?v=BFld4EBO2RE
Painting a Character with Maths - https://www.youtube.com/watch?v=8--5LwHRhjk
Bonus:
Painting with Maths in Google Sheets - https://www.youtube.com/watch?v=JnCkF62gkOY