On our dog-walk yesterday, I took this photo and printed it out in color and in grayscale. The grayscale print has a large X corner-to-corner as a guide for transferring the sketch onto my pastel surface (which also has a large X). The surface for this new painting is a 2009 painting that I spray-washed the pastel off of
in the laundry tub, then laid it face down to dry overnight.
When I unframed the old painting, there was enough Wallis paper (coated with ochre gesso) to make the new painting 1" larger all the way around. Here you can see a charcoal sketch (click on the image to enlarge it) over the top of the old painting.
For the first step, I used four pastels to block in the shapes: my darkest value, my lightest value and two other colors. See the pastel sticks lined up along the bottom.