I made this cake for my friends daughter, she loves Tinkerbell! My girls loved her at one time as well, so I knew a thing or two about Tink;)
I used edible glitter on the fondant, made roses, leaves, and daisies using Wilton Ready Fondant. As for Tink herself I got a figurine doll at the store and I sticked it into the cake just before sending it off! If you have any decorating questions please ask!:)
For the colours I used Purple, Rose, Golden Yellow and Green Wilton gels. You will need 1 8 or 9 inch layer cake and a 6 inch cake for the top layer.
I am really bad at explaining on how to make cakes, so if you have any questions please ask!:)