Step 11: Under Scooby-Doo’s nose, draw his mouth using the initial lines as guides. Make the line for Scooby-Doo’s smile curvy instead of straight, which gives him a goofier look.

Step 12: Use the U shape as a guide to draw Scooby-Doo’s open mouth. Use a curved line to the right of his mouth for his lip and an even bigger curve under his mouth for his big chin.

Step 13: Draw two curved lines inside Scooby-Doo’s mouth for his tongue. Add the extra detail on his muzzle too: two lines over his smile for wrinkles, the hair on his chin and some spots.

Step 14: Draw Scooby-Doo’s ears using the initial shapes as guides. Draw some lines within the shape to indicate the ear opening. Draw the right one folded down for more character. Darken the rest of Scooby-Doo’s head and neck too.

Step 15: Draw Scooby-Doo’s dog tag and give it a ring on top that holds the tag to the collar. Inside the tag draw his initials: SD. Use the image above for further reference for the initials. Tighten the shape of Scooby-Doo’s collar and make it darker.