skelly I used one of those big punchbag balloons kids play with, not sure what you call those in the U.S. basically those annoying balloons that can be filled with rice to make noises when kids punch them.
I just used watered down pva glue and layer upon layer of newspaper strips over the balloon, once dried I stuck a pin in and popped the balloon.
For the eye area I used cardboard slats slipped into the eye hole and hot glued into place it , make the eye area protrude more. Then cpver up any cardboard with a paper mache layer.
When it was all fully dried I just pained it with acrylic paints in pumpkin shade then did some shading with a dry brush using brown and green acrylic paint. Inside I used black spray paint, jetting it around through the eye and mouth holes any dribbles on that managed to get on the outside just got covered back up with the pumpkin paint.
In the eye hole area I used black acrylic paint and around the inner edges of the teeth where the spray paint had missed.
Oh and I just used twisted up tin foil for the stalk and my trusty hot glue gun, then paper mached over the stalk and covering the base of the stalk where I'd attached it to the pumpkin to cover any seams.
I also made the layers thicker in area's around the pumpkin to make it look more pumpkin shaped in the body.
Then finally when all the paint had dried. I gave it a spray with some Plasti-kote Spray Clear Acrylic, which made it nice and rock hard.
