Great job on this cake! :)

!!!! I sooooo want to make this cake, but I have no skills. I do have quite a few of the Wilton tips (including those for leaves, basket weaves, roses, and drop flowers) but I doubt I could accomplish this. Let me ask though...what type of frosting do you use for the flowers? Royal icing? Buttercream? Do you make the flowers off the cake and then let them dry...then place them accordingly? Same question with the leaves? Thank youuuuu!