Bravo to the cool mom for letting her four-year-old order this adorable zombie cake! I assume with shows like the walking dead around, even little tykes are really into gruesome ghouls.
For this cake I used the scallop technique to give it some texture and used rolled fondant for the eyes mouth and brain.
Watch a tutorial on how to do this here.
For the brain I used a thicker piece of fondant with little rolled (longer) pieces underneath and mushed it around to give it that brainy look. I traced around the eyes with green frosting and around the brain the red to make it more realistic and bloody.