Well the horizon ain't really centered, the light house is(horizontally) let me tell you one thing I noticed almost, it's the grad. from dark deep blue to sky blue which is something I like about this photo. I do have astigmatism(not severe) and I look and think there's something wrong with the lines here, but it could be just my eyes.
The negative space up isn't helping or adding much to it. Something is wrong with the balance of the photograph. Also the rule of thirds could have worked well here, because there are parts of the pier(english isn't my first nor second language I donno what else to call it) that are uninteresting, in a way showing the water space between the pier and the end of the frame is annoying, it's tight.
I will not repeat what others have said, but an off topic question because I didn't take a lesson or a course either, I've been on books and photography forums and online resources(not this one, I am also new here). How are you teaching yourself(exchanging some experience, that's all).