Start with the hair in a ponytail high on the crown. I curled the ends because this was for school and I didn't have the full time to do what I would have done had she been getting ready for a night of Trick-or-Treating.
Here we are doing and upside down knot. Push the ponytail up through the part you just made with your comb...
...but only partway through.
Now take and pull the elastic tight. This is where I started tugging pieces of her ponytail out to make it poofier (I don't think that is a word). See those ends? If it had been Halloween, I would have curled sections into ringlets to make it a bit more fancy.
Then I tied a ribbon around the elastic. Had she really been Belle, I would have taken a yellow ribbon and wrapped it around the elastic and tucked the ends.
There you go. My human rendition of Belle's ball hairdo.