This coloring page represents a steep descent. Behind the sign is a bright yellow background, with a car winding its way down a hill. This is illustrated with a black coloring page, with an arrow pointing downwards beneath the sign. To enhance the sense of movement and create an interesting look, I would decide to color the car in red and then shade the sky and hills using light blues and greens. The yellow background would remain, to complete the effect and provide contrast. This would make the sign stand out and the winding path of the car will be more visible. To add further interest, I would use complementary shades and tones on the car and across the landscape.