1) Looks a bit dark on the left side of the pier. Composition is good. Overall shot could be brightened up a bit
2) Phenomenal! Love it!
3) Composition needs a bit of work on this one. Maybe crop in tighter
4) Great shot, but the rocks look a bit dark on the bottom. Maybe try brightening them up a bit?
5) Love the depth of field, takes your eye right to subject. Although, it does look a bit flat. Try bringing the whites and blacks out a bit more to have more 'pop' in the photo. A little vibrance and saturation probably will help out as well