Step 10: Add the top part of the Labrador retriever's muzzle by first drawing a small line under the nose. Follow the lower edge of the initial big circle and draw the right side of the top lip as a wavy line. The lip should end inside the small initial circle. On the left, draw a smaller line for the rest the top lip. Curve the line on the left up to create the bottom edge of the top lip on the left. Use the left edge of the small initial circle as a guide to create the shape of the retriever's muzzle. Darken the top, left side of the small initial circle above the nose to finish the top part of the muzzle.
Step 11: Draw the lower lip/chin under the mouth using a series of curved lines. Make the chin stay within the shape of the small initial circle. Don't draw it too low. Add long, curved lines on the sides for the Labrador retriever's droopy lower lips. The whole shape of the muzzle shouldn't extend outside of the small initial circle too much.
Step 12: Use the big triangle on the right side as a guide to draw the Labrador retriever's first ear. Follow the basic path of the guide but use short strokes as you darken it for a fur-like texture. Make the bottom part of the ear wavier and wider than the guide. Add a few extra short strokes on the top left side for the furry folds of the dog's ear.
Step 13: Use the main circle as a guide to draw the rest of the dog's head. Follow the basic path of the circle but make the top part flatter as you darken the lines. Use short strokes along the way to create a fur-like texture. Make the left side of the head more narrow than the edge of the initial circle. The line right next to the eye should bulge out a bit for more structure. Use short strokes to darken the lines under the head and create a bit of the Labrador retriever's neck.
Step 14: Use the angled line on the left as a guide to draw the retriever's other ear. Draw a long, vertical line at the top that's made up of short strokes for the base of the ear. Then follow the path of the guide but make the lines wavier. The bottom tip of the dog's ear should be thin and extend outside of the guide a bit.