Mike,
If we put our heads together to make a bigger processor and combine all available techniques, I think we could manage to mark a certain point on a canvas.
The way of using the Photo Shop should be effective, (for those who got one).
But I came to think of a simple way of remembering the drawing.: When the drawing is laid, you place a transparent acrylic plate in front of your canvas and draw the main lines on it with a White board Pen. In that way you can always compare your actual drawing to the original one.
Just a thought.
Allan
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