If someone doesn’t know much about facial proportions , what CONCRETE advice would you give to the folks that are newly learning this material ?

Eyes are in the middle of the head, NOT THE TOP, hair usually covers most of the forehead

Answer installations;

The gregorian chant was a major cultural milestone in the middle ages. it was one of the first codified forms of music meant to be played as written, where previously it was difficult to mass-produce and disseminate any music. what's more, these chants were also some of the first examples of musical notation: the notes and bars of today's music sheets are a reflection of centuries of evolution beginning with these chants. it became official throughout the entirety of the catholic church, meaning that nearly all of europe followed this musical notation and styling.