Birthday Cake

I made this cake for my son's 4th birthday; upon his request for a McQueen shaped cake.
This is made with two 13*9 cakes vanilla cake and whipped cream frosting. One I split and kept for the base and another one cut into a car shape. Just basic colors red for the full car and some blue and yellow for the features.For black I got a prepared small tube black frosting, as i was not able to find black food color.