We did it! We carved Tinker Bell into one of our pumpkins! The process was not easy by any means, but our daughter is very happy with the results. My husband and I are glad she is happy with it, but next time we will probably do things a little different.
If you like the Tinker Bell carving and want to use it for your pumpkin, the website with the pattern used for the pumpkin is here. The first time we printed it out, it was a little small for our pumpkin, but you can scan it with your printer and just enlarge the size to what would be right for your pumpkin. Once you have it printed out, you can tape it onto the pumpkin and start poking an outline.
As you are carving the pumpkin, make sure you have a lot of paper towels. You will need the paper towels to wipe away the wet pieces of pumpkin both off the pumpkin (so you can see what you are doing) and also off the table and floor (depending on the speed you set the Dremel to). Make sure to steady the tool with both hands, because it will help you keep a steady hand to carve.
One thing I would change for next time is that for the smaller and more intricate details I would use a small carving knife. The Dremel was great, but it was very hard to get the details of her face and hands with it and I think doing it manually with a little pumpkin carving knife would help with carving those details.