Step 1: Pumpkin Segment
Looking at a pumpkins i estimated that they are made up of around 15 or over segments, i decided to make my segments 20 degrees wide for creating a rotation feature to produce a total of 360 degrees/18 segments when it came to the assembly.
I then created a 3mm fillet around the edge of the segment to give it definition and a realistic look.
Use a shell feature for that hollowed-een effect, chose the two vertical sides and i gave the segment a thickness of 30mm to produce a good fleshy effect.
Step 2: Assembly
For the appearance and for rendering purposes i gave it a textured rubber appearance and an orange olour.
Using a section view you can see the hollowed effect.
You can fillet the edges if so desired.
Next open a new assembly and arrange four of the pumpkin handle in an appropriate manner, i used the mirror component as it produce an uneven finish which looked well with the overall finish.
Once assembled, insert this assembly into the pumpkin assembly produced earlier.
Next cut extrude the scary face to beyond the exterior of the pumpkin outer skin.
Step 5: Light the Pumpkin UP!!
You can also play around with the external light source and the backgrounds for a better rendering effect.