To draw the ridges in the pumpkin, start with a long, thin oval in the center. Draw long C-shaped curves to the left of the oval; to the right of the oval, draw backward C shapes.
Interrupt the lines where they meet the leaf. Around the stem, draw short curves to show other ridges. Draw veins in each of the leaves by drawing gently curving lines.
Use a double curving line for the larger veins.