Very good,
great job on the prestige class.
I originally thought of the mime as similar to a Wraith or undead but you've definitely shown the origins of the creature.

It makes sense to build it like a bard, as bards are the one who created or became them in the Clown wars.

I like the idea of a foe being able to dominate a mime and forcing him to speak therefore removing his powers.

Still great job, Joanna has sent you some links to some photos we uploaded with a creative commons license so you can use em.

After reading your prestige class I can't help but think that The Crow is some sort of a fallen mime.