Next, I did a series of tracings of lines inside of the boat to establish the major features. I made the black lines as a separate "layer", so that I could overlay them onto later drawing to check the accuracy of what I was doing. Note: This drawing is saved as a "transparent" .gif file. It shows only the lines I drew, and will allow the background of what it is placed on top of to show through (in this case, the background color of the Ariel Forum).