Chopping up a sock puppet (photo) for CH?

Cool! You could replace the top half of the mouth image  as well (just move it up a touch), but you dont really need to I think. Looks pretty good!

There is a question of how much effort you are willing to go to. If you want to keep the effort lower, what i suggest doing is create a head with the eyes in it and do not move the head or eyes when talking (don’t tilt back). Only change the mouth in front of the head.

You can achieve it, but its tricky - not my suggested first project!! Keeping the eyes static will make life much easier.

I would take the artwork with mouth closed as the head. I would then take different mouth positions and chop out just the mouth to overlap on top of the default mouth. CH does not care how big they are. You will just put that mouth cutout over the top of the default head image. You can do intermediate layers using cycle layers, but I would start without that if new to CH. Just create single frames for all the mouth positions, capture so when displayed over the top of the puppet it obscures the default had position.

The you will be doing a standard sort of puppet, just with enormous mouth images (which is fine).

If you want the eyes to move during talking, life becomes harder. you need to turn the head into an upside down nutcracker so the top part goes up behavior and attachthe eyes to the bit that moves. But i would avoid this as unnecessary complexity.