R.M.
I made my daughter's 1st birthday cake, and made her a cupcake to really dig into. It is cute in the pictures, a little girl with a little cake.
For a big cake, the key I've found so successful frosting is to have a very first frosting layer that you use JUST to hold the cake together and hold the crumbs in. Then you go back and refrost for the "showing" part.
Also, I put the rounded side of the cake on the bottom,against the plate and on the top - allowing the flat sides to be against each other, which helps the stability.
The great thing is it doesn't matter, your daughter and guests will love it anyway!