This bright red horse is something out of a fantasy story! It's got a single, spiraling horn atop its head and a long, flowing mane and tail. Its deep red coat is perfect for a feeling of both vibrancy and power. It's said to be an incredibly fast Pokemon, able to run great distances at top speed. To bring out the vividness of its color, I would start with shading its mane and tail a light brown shade while keeping its coat a bright, true red. Contrast this with a deep burgundy for its horn and its eyes to create a vibrant yet subtle palette. To bring out the depths of its coat further, add some shading with very light, almost imperceptible strokes of a pink or magenta shade along its sides and haunches. Finally, to bring out the playful side of the horse, give its nose and eyes a spotlight with gold or yellow highlights.