I made my own and LOVE it! I did subsitute all of the sc2tog to the invisible decrease (Planet June has a great photo tutorial on it here: http://www.planetjune.com/blog/amigurumi-help/invisible-decrease/) to create a more seamless look.
I probably crochet "looser" than the designer as my 3-6 month mannequin head had a 17" circumference. Still in the range…but I would have preferred 16".
Kudos to 5 Little Monsters for sharing this great pattern with the crochet community.