Against-the-light landscape photography has always been tricky. You can not choose to set a longer exposure because the human will not appear sharp. With a pool of water in front of you it is also very tricky to use the flash effectively since the flash light would reflect unnaturally against the water. All you can do is just to increase the exposure compensation a step in order to have some more light over the near subjects, paying attention not to burn the background. But the secret ingredient of this image was lots of patience waiting for sun to dive and a perfect reflection when the ocean breeze stopped blowing.
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Exposure bias: + 0,3 EV