Step 20: Draw a small line inside each hindwing at the top near the thorax for the first part of the veins. Then draw a longer curved line. The longer curved lines should start at the top, near the butterfly's thorax, and then curve down toward the outer edges. Above each long line, draw a smaller line that starts near the middle of the long lines and ends on the outer edges. Draw another similarly shaped small line under each of the long curved lines. The end result should be similar to a three-pronged fork.
Step 21: Draw another long line inside each hindwing, on the lower half, for the second part of the veins. These lines should have a diagonal orientation, and they should start near the middle of the thorax like the lines above them. Below each of the long lines, draw two smaller, more vertical lines to complete the veins on the blue morpho butterfly's hindwings.
Step 22: 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 that you may have accidentally erased. You can also LIGHTLY erase some of the final lines so that the colors don't get too muddled with the graphite in the next step.
Final Step: Blue morpho butterflies are colorful, so instead of the usual shading, try coloring your drawing. Start by using black for the body. Use black for the outer edges of the wings too. Use a little less color in random areas to create a few white spots.
Start coloring lightly at first, then build up to the level of black that you want by pushing down harder. Now use dark blue for the outer edges of the wings and the veins. Use these colors to create a blue morpho butterfly. But you can also color your butterfly orange or pink or any other color you want! Add a bit of purple right on top of the dark blue. Add some more dark blue but push a bit harder to start blending the two colors.
Continue adding different shades of blue, like sky blue and light blue, right on top of each other. Push down harder as you color to blend the different shades together. Use a bit more dark blue to emphasize the veins. Coloring can be time- consuming, so be patient and take breaks. It's always a good idea to use reference as you draw. And don't forget to pause the video to draw at your own pace.