Step 5: Darken most of the horizontal construction line for the middle of Kermit the Frog's open mouth. Above that, draw a shape that's similar to a wide, thin triangle for the top part of the mouth. Curve the ends of the mouth up a bit.
Step 6: Below the horizontal construction line, draw a big, V-shaped line for the bottom part of Kermit the Frog's open mouth. The sides of this shape should almost be parallel to the initial circle. The bottom tip should touch the circle's lower edge.
Step 7: On the top part of the bottom half of the mouth, draw a shape that similar to a heart for Kermit the Frog's tongue. Add a line in the middle for extra detail. Inside the top section of the mouth, draw a wavy shape for the throat opening and uvula.
Step 8: Use the initial circle as a guide to draw the shape of Kermit's head. At the top, between the eyes, make the line pointier. For the sides, follow the basic path of the circle but make the sides bulge out more. Make the bottom edge pointier.
Step 9: Below the head, draw a curved line for Kermit the Frog's neck. Add a couple of short lines on the sides to actually connect the head to the neck.