Hi Kim,
When you have an early reservation at one of the park restaurants, there will be one entrance open with a Cast Member verifying reservations. Depending on how early your reservation is, you might see one of the
Disney PhotoPass photographers. If your reservation is an hour before opening I doubt there will be any photographers around, but if it's 15-30 minutes before park opening you might see one or two.
There are varying reports of
Disney PhotoPass photographers stopping by the
Harmony Barber Shop in the Magic Kingdom Park, but their presence isn't guaranteed. I would come prepared to take my own pictures and if there happens to be a photographer there you can consider it a bit of extra pixie dust! Be sure to stop on Main Street, U.S.A. to get a photo of the new haircut with Cinderella Castle in the background!
Please let me know if I can help you with any other questions!
Wishing you a magical vacation,
Amy H