From comicbook.com:
[quote]The stand-ins needed are shorter "Caucasian, Hispanic and Asian looking females over the age of 21," specifically at a height of 4'-4'11" and size 0-4 with dark brown hair.
Likewise, photo doubles for the same, "Caucasian, Hispanic, and Asian-looking females" but this time children, age 6-13, at a similar height of 4'2"-4'5" and also with dark brown hair.[/quote]
Interesting description of what they're looking for.