When working from a photo, I've simplified the grid method for me by printing out the image at exactly the size it will be on the canvas, even if it takes several sheets. After creating the grid, I cut the prints into long strips 3" wide running across the canvas. I lay each strip onto the canvas so I can see both the area I'm drawing and the same area on the print at the same time. Thie eliminates all the conversion of scale and the turning back and forth between canvas and print. This makes the actual drawing process go much faster and the drawing more accurate, more than making up for the extra preparation time.
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