The last stage of a pastel painting is to add a few touches of intensely light or dark color, which picks out detail and helps move the viewer's eye around the composition. The horizon line was added using a very dark, almost Prussian, blue. A hint of spray was added with white coming over the top of the rock outcrop to the right, and a few dark shadow lines were added to the rocks.
It's now time to take a step back and give the painting a critical look (and try turning it upside down to see if there is anything glaringly wrong with the composition).
