I took this photo about a year ago while on a trip to Curacao (Dutch Caribbean). It's a photo of my sister in law doing a refresher scuba course after not having dived for about ten years.
I really wanted to capture the "learning" atmosphere as well as the holiday setting with blue sky and something exotic. The swimming pool of our diving hotel (Habitat, I recommend it if you like to be in the nature part of the island) turned out to be perfect.
Took quite a few clicks to get a good half-shot with all elements in it. The parasol just gives it a nice touch.
Taken with my 5D and a 15mm fisheye, at f10 and 1/200 sec. There was more than enough light to work without flashes and set ISO at 100.