Hi Kreuzberg,
Nice set and in my opinion no 3 is by far the best. The composition is great and the sky superb. You have a problem with the boat which appears a little washed out. I am guessing you got a bit of light into the lens.
With a little work in photoshop you should be able to get selective and bring the colours out a bit more, but will need to work on the original image.
Best regards
Chris