Here is link to part of Marco Bucci’s youtube channel: https://www.youtube.com/watch?v=Nap7dwHjD9Y. And his website: https://www.marcobucci.com/
The youtube link is the first in a series of ten-minute educational videos and demonstrations on some very important aspect of “good” art with reference to masters and how they worked. Enjoy them!!
Although primarily a digital artist and illustrator, Marco’s videos apply to fine art too.