Open GIMP and create a new file.
Click on the "Image" menu and scroll to "Canvas Size." Enter a size between 200 by 200 and 300 by 300.
Click on the "Brush" tool and select black from the color wheel.
Draw the outline of Sailor Moon's head. Draw an oval head and connect it to horizontal shoulders. Inside the head, draw two circular eyes. Draw a short line for the mouth. At the top of the head, draw the concave curve of the hairline. Connect the ends of the hairline to two long pigtails. At the top of each pigtail, draw a small circle.
Connect the head to the torso. Draw the torso as a thin hourglass shape. At the bottom of the hourglass, draw a wide v-shape. Connect each edge of the "v" to a short line that extends downwards and outwards. Connect the two edges with a wavy line to complete the skirt. Draw the neckline as a wide "v." Under the point of the neckline, draw a large bow.
Add arms and legs. Draw the arms as thin lines that rest next to the torso. Each line ends at the middle of the skirt. Draw the hand as a long oval. Draw the legs extending from under the skirt. Each leg is long and thin. At the end of the leg, draw a pointed oval. Add the boots by drawing an upside-down "v' just below the mid-point of each leg. Add the gloves by drawing a horizontal line just above each elbow. Draw the sleeves with a line that divides the shoulder from the upper arm.
Create a new Layer using the "New Layer" button. Add color to this layer using the "Bucket" tool. Add a skin-toned color to the face, arms and legs. Add an off-white color to the shirt and gloves. Color the eyes and skirt with a blue color. Turn the boots, bow and orbs at the top of the pigtails red.
Press the keys "Ctrl" and "S" to save the image.
Create an alternative save file of the image so that you can revert to the original. Click on the "File" menu and scroll to "Save As." Add the word "Flattened" to the end of the current name and press "OK."
Flatten the image. Click on the "Image" menu and scroll to "Flatten Image." Save the image as a JPG and add it to your game or interactive program.