The Cliffs of Monhegan
22 x 30"
I began with the sky. Since it is the most distant space in the painting, I used cerulean and thalo blues, both cool blues. Near the horizon I added some new gamboge to make a light green which would later be echoed in the cliffs.
The sea consists of cool thalos: blue and green.
The cliffs are rendered in warmer blues to contrast with the surrounding colors. The first layer was the purist blue: cobalt. Since it is more opaque than the other blues, it also makes sense to place it on the bottom.
Next came a very transparent blue: ultramarine, a warm blue leaning to the red side. I dashed in a little alizarin to further enhance the violet, mixing all colors on the page, not the palette. As I got to the foreground, I warmed up the blue with a bit of burnt sienna and raw sienna.
All these blues needed some contrast, hence the grassy green areas on the the mid-ground cliffs. That was also a mixed green of new gamboge and a dash of cobalt blue. The use of another blue that was used elsewhere in the painting gives some unity.
Experiment with a variety of blues to create contrast and interest.