To do Scooby Doo you get an image of Scooby Doo to use as a reference. Glance at the shape of his head, neck and body. Next, draw Scooby Doo's muzzle and legs. The muzzle is a circle, overlapping the right corner of his head. Draw Scooby Doo's face. Draw Scooby Doo's mouth, dog collar and back. The mouth hangs open, like an upside down u-shape, with three teeth below his muzzle. Draw Scooby Doo's legs and paws. Track the shapes that you sketched for the legs, and draw four fingers on each paw. Finally the guiding lines, reinforce the main lines of the Scooby Doo drawing, and draw a diamond-shaped dog tag on Scooby Doo's collar.