After a simple sketch I wetted the sky behind the lighthouse for the wave. I painted quickly with a wash from Cobalt blue into the wave, after that I painted the rocks in with raw Umber, and gave them some shadow, also the wet rocks where painted in direct. The sea was washed down in one go. Cereleum and raw Umber. As last the lighthouse, not to fiddly, but a bit sloppiness give the best result!