With landscape photos, especially where there is a horizon, make sure you get it level. And then in post-processing, check that it is level, and if not, level it. This is important because visually, a crooked horizon is just bad!! And very noticeable with sea horizons.
In the first image there is a significant amount of noise in the sky; foreground is underexposed and blurry. 2nd image: Leaning horizon and also some noise in the sky.