Firstly bake the cake. (two recipes to choose from. a tasty vanilla cake.) see the link above for chocolate cake.

Ice your cake and get it placed on a plate to add the fondant.

Roll out the fondant evenly and make it the diameter you need to cover the total cake.

Place it carefully over the iced cake and smooth it out on the top and the sides.

Then place you printed faces of the princesses on the sides leaving enough space to add the fondant dresses.

Split your fondant to color some different colors for the dresses. Keep rolled in a ball. Then roll out each one individually. Big enough for just a dress. Fold it slightly for a flowing look. Then make a small piece for the top of the dress and press in some paten with a fondant tool. Make the sleeves with a little twirl or puff kind of sleeve. Paste these on the fondant with a small brush and a tiny bit of water to stick. (be careful not to use to much water)

Do the same for all the princesses dresses.

After you have completed this part then you can add all your sparkles such as edible glitter on the dresses and some cake decorations where ever you would like to decorate to look pretty. 

Add a princesses tiara on the top of the cake. 

Place the finished cake on a cake stand and add some very attractive dingles or any thing that would enhance the total look for a birthday.

enjoy.