Step 15: Add more strokes above and below the circles on the hindwing to complete the pattern. The curved lines formed by the short strokes at the top should be smaller than the curved lines at the bottom. Don't draw the strokes too long, otherwise the furry texture on the moth's wings will appear too shaggy.
Step 16: For a cleaner look, erase as much as you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Re-draw any final sketch lines you may have accidentally erased.
Final Step: Add some shading to your emperor moth drawing for extra detail. Add a bit of value to the antennae. Leave the top part of the torso bank and use a dark value and a medium value for the rest of it. Vary the pressure on your pencil to get different degrees of tonal value. Use different values to create the pattern on the moth's wings. For a more detailed guide on how to shade, check out this tutorial: How to shade.
Use strokes that go in the general direction of the emperor moth's furry wings. To the right of the first circle, leave a thin area blank between two dark stripes to create a white stripe. Near the bottom of the forewing, draw another stripe the same way: a blank stripe between dark stripes. Use a medium value for the area around the circle and between the top and bottom dark stripes. If you want your moth to be a different species from the emperor moth, shade your drawing differently.
Draw some lines on the lower edge of the forewing. Add a big, dark spot in the middle of the circle and darken its edge. Shade the emperor moth's hindwing using the same technique of applying different values. Shade a similar pattern on the hindwing of two blank stripes surrounded by black stripes with a medium value in the middle. Draw a big, dark spot inside the circle and darken its edge. Draw a series of vertical lines to the entire hindwing.
Use the left side as a template to shade the right side. The wings don't have to be perfectly symmetrical, but try to make them similar. It's a good idea to use reference for a more accurate depiction of the moth you're trying to draw. Certain species of moths are very colorful, so if you'd like, you can color your drawing instead!
As you shade your emperor moth drawing, add the value lightly at first. Gradually make it darker until you're happy with the result. Shading can be time-consuming, so be patient and take breaks. Don't forget to pause the video after each step to draw at your own pace.