Other than the slight horizon tilt, I wouldn't change a thing. The balance may not conform to normal rules, in regards to the angle or placement of the lighthouse, but I don't find it distractingly low and see the lighthouse as a complementary component of the composition, but not the sole focus. For me, it anchors the sea, which is the primary subject, and gives a counterpoint for the vast expanse of ocean and distant horizon. Sometimes not conforming to classic rules of thumb produces more distinct images. In my mind, you have done just that. Thanks for sharing.