See the step-by-step photos here.
Here is a little 6x6 piece of a bridge from highway 1, somewhere north of Big Sur. There was a dirt road at the very bottom of that ravine. I liked the composition, as well as the thin diagonals created by the shadows of the cables. The strong morning sun and high humidity made for some great atmospheric haze.
My palette here is cadmium yellow light, cadmium red light, alizarin crimson, cobalt blue, and viridian.