To support the fondant, use a dense chocolate or vanilla cake mix.
Using a cake leveler or serrated knife, make sure every cake layer is level.
Cover the crumbs with a thin layer of buttercream or ganache, then refrigerate the cake.
A smoother surface and better handling may be achieved by investing in high-quality fondant.
For vivid hues without changing the consistency of the fondant, use gel food coloring.