Hi Jeanna! Getting your son's first haircut at the Magic Kingdom sounds like a great idea. How special!
I scoured the Disney website, but was unsuccessful in finding any photos of the Harmony Barbershop. However, I did have some luck at
www.allears.net . When you get to the site, click on 'SEARCH' in the blue bar at the top of the page. Type in "Harmony Barbershop", and a list of matches will come up. The first match on the list will take you to a photo gallery and the second match is an article about the barbershop.
The photos are all of guests who have gotten their hair cut and/or styled at the barbershop. There are quite a few photos of first haircuts, complete with special Mickey ears! Hopefully this will give you a good idea of what you can expect.
Have a magical vacation and be sure to take plenty of pictures of this special milestone in your son's life!