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1. Use a surface/canvas that is 5x8in. (or whatever you think, just small enough that it can be done quickly and photographed to show the 2 images).
2. Set up your easel next to the subject such that the entire desired image is at the exact same size as canvas.
3. Paint the image only while in that position, so that you can clearly and quickly see differences between your painting and the subject. Of course, with landscape we often want to change, but for the exercise try to keep it close to the actual subject.
4. Post a picture showing both together.
5. Hint: it might be helpful to make a clear grid (or just a mat) which is exactly the same size as your canvas and hold or mount it next to your canvas. What's in it will constitute the painting. So no enlarging or shrinking to make it fit - this being the point of sight size. James Gurney made a remark on this which is what opened my eyes to the whole idea. Along the lines of, "the image should take up a space the size of your canvas, right above (next to) the canvas. A lot of my pictures have my painting below the image but I think it is much easier for the beginner to have the canvas beside the image to exactly compare heights (rather than widths for example). The painting should "fit" exactly into the scene in place of what's being painted, and visually that is very effective at getting across the point.
Please be sure to follow the spirit and the letter of the challenge.
For example, each submission must be painted after the challenge is posted.