Here's a another viewpoint but not about the tech qualities of the picture which I think has already been addressed. It's more about the composition.
First, the picture is good as it is with some of the suggestions made previously, however my personal opinion is that the jetty occupies too much of the horizontal space in the shot. It doesn't have enough space to breathe on the right.
I think by showing more of the ocean and beach on the right it will give more impact to the image of the jetty stretching out into the ocean. Also to solve some of your other problems maybe a late afternoon or evening shot would be a cure for some of the lighting problems.
Of course if you can't go back to the location and follow up on my suggestions it's pretty much a bust.
Aloha and keep clicking away.