Your second shot uses a large, strong, and visually interesting foreground element in a very nice manner! Kudos! Your first shot uses the rip-rap around the harbor as a way to "contain" the frame, and to show a bit of context, so props on that. Your third shot, the one with the lighthouse and buildings (???), has almost nothing of real visual interest in the bottom areas of the shot, and it has a LOT of sky, and is the least interesting shot of all. It's a good example of the "far-away and uninteresting look" that a wide-angle lens setting can impart when used in certain situations.
The grasses and their lovely purple-hued seed heads....now THAT is a fabulous way to draw the viewer INTO THE SHOT! It conveys a sense of where you stood, and also shows us the actual season of the year.
The first shot, the sunset at the harbor...I can see into that file...that shot could have some software manipulation done on it, to increase the contrast and vibrancy in the "low tones", and it would be greatly improved with some careful software "expansion" of the low tones' color values. It seems just a bit dull in the low tones, which tend to sort of mush together on digital captures. The shadows on digital files have the least amount of separation, and they need work many times to "expand" the differences in close tonal values.