The focus was on infinity ...
PS, just in general.. I LOVE the look of overlook photos.. Photography is an art.. We are all artist. So if you see a picture a raf over exposed.. Just remember I like it that way!!
Well, that is the problem with asking for a critique, isn't it? Since the word itself begins with the idea of being critical, that's mostly what you get.
As in many fields of subjective opinion, there are those who will fall back on, "The only thing that matters is whether I like it." As if pornography were that simple!
If you're not trying to make money from your work, that's fine. However, there are a few basic rules which should be followed or at least acknowledged. How many articles have you read about breaking rules? Too many IMO. But rules are only guidelines to a given situation. What looks good to you is in many ways what looks good to you. As you go forward, what you like is probably going to change as you are exposed to more ideas.
As a budding photographer just learning to move the command dial off "Auto", bravo! I'd say you have every right to be proud of that shot. Remember, what you get as criticism is only what others would have seen and done - had they been there. More experience will gain you more ideas and you will eventually get to that point if you continue onward. I would definitely hang on to this one though. And in another few months of shooting look back at what you had then and what you are getting and aiming at in the future. Be critical of your own work and don't take much of what others say. They weren't there.
As to a subject being required; I tend to consider photography as the function of capturing an event. The photographer is showing us their impression of one brief moment in time and the image should indicate a story line. Even a fairly static image such as yours should have a story of sorts. So, if you had to put an event into your shot, what would you say was the event you captured?
And, looking at your shot, about the only thing I would really have wanted from you at the time, given your experience level and the reason you were on the beach, is to have moved that horizon line downward. Centering strong lines such as a horizon should be saved for those moments when you wish to direct the viewer's eye to something else in the image of greater importance. At least, that's my opinion. I would have asked you to crouch down to give us a different viewpoint.
Otherwise, very good work for your initial venture into non-Auto mode. Save it to a back up drive and play with it in your image processing.