Since this spot is impossible to paint on site, I had to work exclusively from photo reference. Although I prefer to work from observation, in the end, I can work either way (and I'm usually the only one who can tell which are done from the motif and which are done from photos). It proved to be a difficult spot even to take the photos. I managed to convince my wife to pull over to the shoulder of the expressway one afternoon, with my whole family in tow, risking life and limb as I reached out the passenger side door as cars were zooming by at 40-50 MPH, to take about 2 dozen reference photos. I edited a few larger panoramas and from there the client and I agreed on the final scope of the scene and size (it was a longer format than I'm used to painting on, and I rounded the proportions off to a double square, 12" x 36")
From the photos, I did this mock up drawing, trying to set up visual rhythms in the rectangle and adjusted certain elements so that they would line up with the rebatement of the square.
After the client approved both studies (he was a pleasure to work for, having no objections to what I proposed and sent along the way), I stretched the final canvas and began work. Because there was a lot of earth colors in the foreground and a large area of water, I decided to start off with a toned canvas rather than the white of the gesso. I usually do this by thinning a mixture of raw umber and burnt umber with turpentine, brushing it over the gessoed linen and then rubbing it off after about an hour. Once this dries, I start back in with a thin brush and black paint, drawing the linear elements and blocking in larger patches of color with a palette knife and wide brush.
My biggest problem with studio paintings, especially ones done from photographic sources, is that the situation lacks the immediacy of working directly from the motif. Trying to capturing Nature's more fleeting elements (clouds, light and shadow, and the different subtlties of color) keeps me on my toes; without that, the brush work and paint handling can stiffen up and get contrived. I try to augment this tendency by sometimes working on the painting upside or without any reference in front of me, seeing the painting as an abstract organization of colored shapes and textures. Here are some of the progress shots along with details that I sent the client along the way: