This coloring page depicts a beautiful dark-coated horse with a lighter-colored mane and tail standing in a field. It is watchful, with its ears pointed towards the direction its head is slightly turned to the left and its left front hoof resting on a large round rock. To emphasize the horse's alertness, you could color the mane and tail in warm, golden tones, and the coat in darker hues of grey and black. To complement the round rock and the field, you could use bright greens and yellows, while the warm tones of the mane and tail will create a striking contrast. The left hoof should be highlighted to draw attention to it and further add to the sense of movement in the scene.