I took the underwater picture when my daughter and son in law made a large pond in their garden and filed it away about 14 years ago thinking I might do something with it. In Malta, a few years later I went to a dolphin show and got the dolphin pictures. My two granddaughters were on the trampoline and I took pictures of them, again to put on file.. Looking at the dolphins and the cut out pictures of the girls I just thought underwater scene. There is about 14 layers and I tried to get the girls' positions to interact with the dolphins. I used masks to get some parts behind the weed to get depth to it and just played with it till I was happy... Added a few air bubbles to finish it off.