I would like to commission a painting of a boat using marine chart paper. My first (and principle) inquiry concerns the best medium, i.e., oil, watercolor, tempura, etc. I want a nicely defined reasonable detailed representation, but I want it on the chart paper (treated for use in bad weather). Bear in mind, also, that the chart contains a considerable amount of printed data that the boat image must compete with. What are Ms. Mulvany's thoughts on this? Thank you. Woody Martin