The tiny details are the most difficult part of the process. Each bit of color is made up of a piece of fabric that I cut out and then stitch down. Some of these pieces are minuscule. One of the problems with using this particular image is that the details in the stern of the ship are off in the distance and therefore much smaller. For this kind of art, smaller means more difficult.
In the 3 1/2 minute video below you can see a little of the process, including the mistake. (I made the hatch about 1/16" too wide.) This is what I have to do for each tiny piece of fabric (preferably without any mistakes). The video ended about 3 seconds too early. All it's missing is me ironing down the piece shown in the above image. Next the piece is stitched with an appropriate thread color or colors.