There is unity with the consistent use of green for the characters. There is regular rhythm with the repeated element of the wheels. The proportion of the car is also great for its purpose.
Front View
The windshield has a triangular form. The wood has a grainy texture. The wheels have radial balance around the center point of the wheel. By making the windshield transparent and green you are adding emphasis. It is also economic because it is small and easy to use.
Right side View
This view of the Automoblox car shows some contrast between the wood color of the body and the bright green of the wheels and windshield. The windshield appears as a rectangular shape in this view. There is negative space where the headlights are.