I would color this Kawaii cute coloring page of a fox with a vintage style approach. I would start by adding depth to the image using a lighter brown for the outlines and a deeper brown for the fox's fur. To accentuate the fox's features, I would use a lighter shade of brown for the nose and ears, and a bright yellow for the eyes. To add a pop of color to the page, I would use a bright orange for the fox's tail. Finally, I would use a muted green to create a forest background for the fox to stand in, so the picture will really stand out.