The first ship was originally a project in Illustrator 3 from 1991. A few years ago, I went back and worked on it some more with Illustrator 10 and then CS5. The original was a painting of one of Ferdinand Magellan's ships from a National Geographic magazine. The second ship originates from what I used to draw when I was in elementary school. I never copied these from other artwork, they just evolved over the years.