I really don't see how you're going to be able to get expressions... :/ My suggestion is choosing one expression and doing something like perhaps sculpting a mask or perhaps commissioning a make up artist to do a mask.
Ezio Auditore da Firenze (AC II)
Moka Akashiya (Rosario + Vampire)
Mare Do Well (My Little Pony)
Next Con: SacAnime Summer 2014*maybe*
I like nonsense, it wakes up the brain cells. Fantasy is a necessary ingredient in living, it's a way of looking at life through the wrong end of a telescope. Which is what I do, and that enables you to laugh at life's realities.