An artist/teacher named mickymouse posted the following advice :
Equanimy. (I think mickymouse meant equanimity?)
Showing the good points and the bad points in equal proportion in the student work.
At the beginning.
Then gradually increasing the level of critique, the required level.
Showing alternatives, different ways to look at the same problem, asking if the student made the effort of trying to look at the problem through different angles, using self-criticism.
Asking him then if he thinks he put sufficient effort or not. Asking him if the subject was good enough to be developped and worked more or if his critical eye should have seen it was a project to be left at the stage of idea.
As Sol Lewitt would say "For each work of art that becomes physical there are many variations that do not."
Teaching is hard, and especially in art. You can still provide good tools, and make student understand what is of value, and why there is value. Even the great thinkers of our times have had a hard time at this (Lyotard, Habermas, Daniel Bell, Halley).
honoria at Saatchi's Your Gallery