Do you see the box surrounding the circle? Click on the dot on the bottom left corner, hold your mouse button down, and drag it to the left so that the bottom of the pumpkin swells to the left. Then click on the dot on the bottom right corner, hold your mouse button down, and drag it to the right so that the bottom of the pumpkin swells to the right, and matches the left side.
There! Now its shaped more like a real pumpkin.