I don't have good results with dusting my mold with cornstarch to prevent sugar from sticking. I've found that the best way for me is to simply wipe all moisture out each time before I mold another egg. I just made several and the hardest part for me was cutting open the viewing hole. The egg fell to pieces in my hand. I like to use edible deco in my sugar eggs, but ones that will keep - not chocolate because it turns white.
Many people keep sugar eggs for years.
I want it to stay looking nice for them. It's in the 1991 yearbook. Make the car out of cake in the pans and bunnies of candy. You can make a pattern for this so both halves are the same. Place a tiny scenery in bottom half.