Yes, it does, but it will also get the qualifier (as illusion) and possibly be listed under interesting alterations.
From the FAQ:
Q. What counts as an appearance?
A. Any likeness of the character being visible (so Elan's appearance on Nale's blueprint counts, and Belkar's self-portrait in blood counts) and any dialog from a character, even if "off-panel" or invisible (so the strip where the party is in the invisibility sphere counts for each of the main characters). Also, when someone appears as someone else (for instance when Nale impersonates Elan), that counts as an appearance for both the character in disguise and the character being impersonated.