This scene has a somewhat complicated lighting setup. The various lights are linked to respective geometry. A spotlight inside the Jack-O-Lanter lights the interior of the pumpkin. This light has its intensity linked by expression to another light that replicates light on the lid of the pumpkin and on the knife wedged in the pumpkin's back. Change the intensity to the main Jack-O-Lantern inner spotlight and it will change the spotlight for the lid and knife.
There are several fluids to give the illusion of the fog, the atmosphere. These had to be lit seperately.
The moon has a procedural texture and is lit seperately.
There are Maya procedural textures on the ground and on the knife handle.
The Jack-O-Lantern and the pumpkins have textures created in Photoshop CS6. They are large maps and can be scaled down if needed using photoshop. These maps are color and bump maps and in some cases, the bumps are being used also for reflectivity.