I am making some new Dutch ship wargame pieces

I finally am making some progress on new Dutch ship wargame pieces. I am using a combination of Paint and the GIMP for graphic editing. I am working at a scale of 120 x 120 pixels per inch. My scale is set so that five pixels are two Amsterdam feet (what I said first one incorrect: five pixels = 1 foot). The ship drawings are really just symbolic, and not intended to be very realistic. I just don't have the time to do that sort of work. I am trying to mass-produce some new ship pieces based on what I have learned in the last two years.