The colors on the second one are beautiful! My only nitpicks with that one are that there is no distinct subject in the photo (no dramatic skyline, but that's not your fault), and that the horizon is right in the middle of the frame. It is normally recommended to make either one or the other the focus of the photograph, and in this case I would make it the sky since it was a spectacular sunset.
The second photo is interesting, but I think you should have used a fast shutter speed to capture the movement and drama of the water splashing on the rocks. The slower shutter speed just kind of makes it look like steam or fog rising off the water. I like how it was done in black and white rather than color.