What would help is if you had a phonemes chart... or in laments terms. A chart with belladonna saying her A E I O U's her P's, Q's etc etc... it would help in the long run. Although I never did any animations in the past, I just know that from watching a Nightmare before Christmas behind the scenes featureette.

That is if you plan to do any more in the future. I might even make a phonemes chart meme