I consider this my most successful colouring job on a dolphin to date.  For her body, I used two different combinations of two markers (a set of two for her underbelly, and a set of two for her head, arms, back and tail).  I just wish to god that I wrote down just which set of four markers that was, and the pencils I used with them >:(  

Anyhow, this was one of the most popular pics that I ever posted; the response was just incredible.  Apparently, I corrupted a fair number of people into liking dolphin morphs with her, and I still get emails from new fans that have fallen in love with the pic.

And despite all that, I've only sold a couple prints of her :/