I read a book that suggested a radical technique using a spray bottle on an already-wet canvas, to give the impression of a stormy seascape. Even with my limited skill set, I was able to achieve some of the effects here. Despite the amateurish-looking boats (one smack dab in the middle of the page) it goes to show that with watercolour sometimes the water does the work for you.
The colours don't really jive, and there's probably too much grey, which deadens the feel of the page. But the technique is worth hanging on to.