Fantasy novel, published between 1980 and 1995. Possibly Young Adult novel.
The main character is a glassblower who has the ability to control animals by making special glass that is the precise colour of their eyes.
Stump the Bookseller
New format, same book stumper solving.
Maybe Mindy L Klasky’s The Glasswright’s Apprentice.
Probably not The Glassblower’s Children by Maria Gripe, but it’s worth putting out there just in case.
Possibly Mindy L Klasky’s The Glasswright’s Apprentice.