Lightening McQueen Theme

My cousin's son Aiden turn 2 years older today. I made him a surprise birthday cake for the cute birthday boy. At first, I don't know what theme should i make but then typical boy likes to play mostly cars, right?. I ask myself "Who's the most known car character for the boys?" Alas, it's Disney Pixar character Lightening McQueen from Disney. Here it is:

Cake is made of Marshmallow fondant in Chocolate cake

with chocolate buttercream frosting.