A friend of mine came to me asking for an image of a halibut's tail for a shirt he wanted to make. The markings on the tail of a halibut are unique, so this would be the tail of the largest fish he and his crew caught last season. I painted up the tail, boat, and water in Gimp and he took it, added the words and the fishing grounds background. I'm super happy with the way it turned out. I think he did an awesome job.
It was a lot of fun painting the tail and the boat. My friend provided me with a ton of reference photos so the actual image was a breeze to make.