Cake for my son’s 4th birthday!

Lightning McQueen was able to be removed from the top and could ride the track through his cake! I am definitely far from professional, but his mind was blown and that was the best feeling!🥰
that said, i really enjoy pushing myself. Any tips, comments, recommendations, etc that I could do better when doing cakes/working with fondant decorations? Always want to get better! 😊