Draw a simple horizontal line for the closed mouth
Add a curved line for a neutral mouth shape
Sketch an oval or rounded rectangle for an open mouth
Draw the upper lip with a soft curve
Draw the lower lip with a smaller curve
Add teeth as a thin horizontal shape inside the mouth
Leave a gap for the tongue if needed
Draw the tongue as a rounded shape near the bottom
Vary the mouth shape for different expressions
Make the corners lift for a smile
Pull the corners down for a frown
Open the mouth wider for shouting
Keep the shapes clean and simple for animation
Draw multiple mouth poses for different frames
Match each mouth shape to the character’s expression
Outline the final mouth with clear lines
Fill in the mouth with solid colors if desired