I got that art lesson idea (drawing from a model wearing a Victorian
half mask) from the book
Early Childhood Art -4thth edition
by Barbara Herberholz, Lee C Hanson
It appears on page 136
A quick search of Amazon Books produced a 5thth edition
About the masks themselves…I got them years ago at the Vermont Country
Store, but I see them on the link below. They are Victorian half
masks, and really just right for this project. Scroll down the page
until you see them under the heading "bulk masks for parties"