Normally illusions must be manipulated by their creator to seem real. But since your micro-world is controlled by illusions, well, it will probably be pretty stationary.
A charmer wouldn't have much fun in there. He'd have at least two options:
1) Walk around saying, "I'm charming This illusion," to let the illusion's creator know what it's supposed to do or...
2) Use Mordenkainen's Magical Illusion Charmer, which, as everyone knows, is a jester cap which, when worn, allows one's charm spells to affect illusions.