Having established the fundamentals of the shadows on the wave, I now returned to titanium white to paint the foam on the edge of the wave. I started with the top ridge (Photo 7), before moving onto the breaking wave.
The paint was applied by jerking the brush up and down, not pulling it along the canvas. (I think of this as the "Dibby-Dabby School of Painting" -- dib it in some paint and dab it on the canvas.) I was using a worn filbert -shaped brush. The stiff bristles splay out a bit, producing a rough-edged paint mark, so it's very useful for painting a feeling of foam.
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