This is what I wrote in the other thread about what I look for in a good face character:
Here's what I look for in a good face character: first they must actually look like the character they are portraying. If someone doesn't that is honestly not their fault, it's casting's fault for allowing this person to be in the park. Secondly, they must have specific character mannerisms down. Third, their voice should match their character (accent, tone, Snow White should have a soft & sweet voice, Maleficent should sound evil). Lastly they should be able to improv as their character. Add in normal character rules and guidelines and that is how I base a good or bad character.
A person could be a dead ringer but have mannerisms and the voice be off. Unfortunately Disney doesn't give performers much time to learn it and perfect it. You get a day or two tops training on your specific face role and then you're on your own. Quite intimidating when you have guests surround you 360 degrees.
I feel a lot of female face characters at DL are way too old for their role (esp Ariel, Wendy, Alice) or they look nothing like the character (Belle, Aurora, Cindy). This is not the fault of the performer. If they are too old management should take them out of the role. If they don't look like the character they should never have been cast. In my opinion, parade and Fantasmic! are the worst at keeping face character standards. I have also seen some wonderful performers and they have almost always been doing greetings in the park. Again, this is my opinion.
I love that Alice. She is spot on with her voice. Littlecricket has several videos featuring her. I also love the one she calls the Carebear Alice. I met her when i was there. Also the Princess Aurora I met when I was there in December was amazing. She was so pretty and so much like the true Aurora.