I shot this in RAW in bright sunset light (the girls were running around under water) and then I imported in in Photoshop and increased contrast and the darkness of "shadows" to the maximum et voilà.
I think I had a dream like this once... lol. Very nice photo! The contrast between the sunset through the water and the shadows makes for a great affect. (effect? Whatever...)
Et j'adore ta description français/anglais. Mdr