Dolphin Pictures for a cake

My daughter wanted a dolphin theme for her party - I thought this would be easy, but no party store or bakery has a dolphin theme. Too late for internet purchases, but I thought I could have a dolphin picture put on a cake. I know a store bakery that does a wonderful job with this.

Does anyone have any good quality pictures that might look good on a cake? I am having a difficult time finding one that would seem clear enough for a good look on a cake.