I like #1 & #2. Interesting composition on both. Tweaking the image by using curves or saturation bump would make it even better by making the colors more vibrant.
#1 - I would clone out the birds in the sky. They're too small in the photo anyway and, at least in this size, look like dirt spots. And maybe clone out the boat to the left... It looks out of place.
#3 - Rule of thirds helped a little here, although, personally, I find objects against a horizon by themselves a little boring. It may be difficult in this case, but I find landscapes that have something interesting in the foreground, midground, and background are the most captivating.