Lovely colors in the sky. I also like how the surf flows to and from each side of the image, nice composition. I think I'd actually like it better without the people in it, but I understand that probably wasn't possible.
Great patterns on the water, and a beautiful sky. The people add a focal point that leads into the picture. Where I am, north of New York City, there's a foot of snow on the ground. Where was this taken?
Vertical shot gives good interest to the composition. I believe taking some of the bottom part out may help enhance the interest a bit more. The colors of the sky are absolutely beautiful, great hues of blue captured. Highlights in the water are also very nicely captured.