Building a stop-action rabbit figure
Doing a google on "Mackinnon &amp; Saunders" and "stop-motion" and "materials for puppets" yields that foam latex underneath and silicone molded skins (often made from a plasticine sculpture; and that the mold can take longer than the sculpt) are often used over the amatures on the models that they make for feature films. The main issue is going to be putting in movement capability for expressiveness on the face.

Mackinnon &amp; Saunders made adjustable face mechanisms for the puppets on The Corpse Bride that eliminated the need for face replacement that had been used on Nightmare Before Christmas and Coraline, and that single wire you've got for the ear may not allow you to, say, curl over a tip, with any control. So you may still need to build interior support over the armature that can take repeated small movements.

This blog entry lists a bunch of other materials that are probably easier to acquire and use:


  Urethane foam is also known as cushion foam or upholstery foam. It's generally done by glueing foam on to an armature and shaping with scissors. A skin can be made covered with clothing sewn from fabric. Heads can be made from hard materials like polymer clay or wood, or cast from resin. Hands can be made by coating wire with liquid latex. This is a good simple way to make puppets—easier to animate than clay.


You may want to take a look around a stop-motion animation messageboard, like this one:

http://www.stopmotionanimation.com/forum