Step 20 (optional): 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.
Final Step (optional): You can add value throughout your quail drawing for extra detail. Use a dark value when you shade the group of drooping feathers on the head. Use a dark value on the head as well but leave the banded pattern blank. Use a slightly lighter value on the beak.
Draw a series of random squiggles on the bird's neck for the pattern found there. Don't worry too much about the squiggles being perfect. Just add them randomly. Use a medium value for the left side of the quail's body. As you add the value, use strokes that go in the general direction of the feathers. Vary the pressure on your pencil to get different degrees of tonal value.
Use a series of overlapping short, curved lines for the pattern on the underside of the body. Drawing this pattern can be tricky and time-consuming, so be patient, take breaks and pause the video as you follow along. It's always a good idea to use reference as you draw. Use a medium value for the bird's tail and legs.
Add a dark value at the bottom of the body. This gives the quail more dimension and volume.
Add a cast shadow underneath. This helps ground the quail so it doesn't appear to be floating.