I think the same principles apply to using digital photos as a basis for
painting/drwing. Contemporary professional artists are doing this all the
Just as a point of information, artists, illustrators especially, have been
using opaque projectors for years. ... However, what needs to be stressed
is to learn how to draw first, before relying on a machine.
... There is nothing wrong with a projector as long as you teach them not to
use it as a crutch.