30 minutes?? you can do better than that haha :P looks ok so far, not much to critique at the moment except for both of the right wheels looks a bit strange. Keep going and we'll see how you fare later on

By the way, I suggest not using gradients if you were planning on it. It can get a little tricky of there are a lot of reflections you need to recreate. Also, using layers of solid colors gives it a nicer, more stylized look.