Photograph of a portrait of John Knox by Theodore de Beze from 1580 turned into a sketch to be used for mindful colouring. 

The manuscript is held in Centre for Research Collections.
Details of original:
Title: John Knox (1509-1572)
Creator: Theodore de Beze (b.1519, d.1605)
Item/Collection reference: 0041844c
Collection name: Museums
It can be viewed online here: https://images.is.ed.ac.uk/luna/servlet/detail/UoEhal~2~2~100083~100042:Knox?qvq=q:0041844c&mi=0&trs...