I have made this cake for my niece and everyone loves it, so i thought i would share it here with you.
In terms of difficulty ,as long as you are familiar with fondant and royal icing, this shouldn't be too big of a challenge.
Step 1: What you will need
empty cereal box to make cardboard template
icing -for crumb coat
dragees -to glam up your tiara (optional)
card board cake circle
meringue powder as per your royal icing recipe
luster dust (optional)