If you saw the couple first, you should still be able to see the dolphins if you look for them (like most double image pictures).
Here's a hit about the location of some of the dolphins:
Look at the space between her right arm and her head, the tail is on her neck, follow it up. There is another dolphin on the other side of her neck. Look at her left hip, follow the shaded part down. There is another one on his shoulder.....
So... what did you see first, and could you find all of the dolphins?