MT, I've been looking at those pics and there's another thing you could do with the stem. If you look closely at the reference pics below, you can see that the base of the stem has rounded ridges. When dry, these ridges take on a spiral shape. You can make these in a couple of ways. You can add worm-like strips of DAS clay, or Paperclay, dip the "worms" in water and then drape them onto your sculpt. Then simply take a small artist brush smooth the entire "worm" down onto the stem. Add a small ball of clay where the stem meets the pumpkin and smooth with the paintbrush to blend just where the base gradually merges with those "worms". You can press down on those balls of clay just to set them. Then very gently brush a bit more water on the area. Another option would be to sculpt those ridges in while the clay is moist. Something to consider getting for making really nice "worm" shapes is a gadget called a clay extruder. I purchased mine at Michaels and found it to be very useful.
These are some pumpkins that I grew a couple of years ago. They looked good after they were picked for another 9 months. When they finally did start to rot, I just HAD to take some pics. Hopefully these will be some decent reference pics for ya.