Argh! That picture will not die. Well, there is a picture of Aerith's face out there, sorta...

http://media.adventchildren.net/scans/fa723_mobile.jpg

(It's a tiny picture, beside Cloud and Tifa's headshots.) It's for the mobile phone featured in the movie. (There's even a site that has the Aerith mobile phone background(?) in action, where she waves, and then puts her hand to her mouth to giggle I supposed.)

EDIT: http://www.adventchildren.net/ff7ac/...from=&ucat=33&

Here you can access links to the actual clip of Aerith doing her stuff.

EDIT AGAIN: I personally can't get the links to work. I think the data may have been removed. Or it might be the browser I'm using. Who knows. Sorry.