After rough sketching, I painted the sky, using the watercolor tool of the Tayasui Sketches app that doesn’t “dry” until you tap the drop icon. While the paper was “wet” I added blue to my purple wash near the horizon:
On a different layer, I painted the sea:
On a third layer, I painted the rocky island, including the fort. I erased paint from the sailboat and the surf around it. And added a few strokes of different blue on the sea layer:
Then I painted the fort red, darkened the rocks, erased paint where the seagulls were, and painted the sailboat:
koalie’s contemplations in markup 