This watercolor demonstration by Henry W. Dixon includes instructions for using computer to scan a photo and enlarge it to transfer a drawing. Dixon explains how to section an image into separate files for printing on standard paper sizes. A useful tip for printing out any large drawing or photo.
Part 2 of this article is step-by-step instructions for painting the above watercolor "Apples in a Barrel". This demonstrations is an excerpt from the book Paint Amazing Watercolors from Photographs by Henry Dixon.