"Montana Mustang" premade bookcover. $100. (Price includes typography setting your title and support text, and some minor image customization.)
The horse is already in motion as the rider mounts. Silhouettes of horse and rider and mountains imply dusk or night time. The drop shadow on the figures, and the small "breakout" where the rider's hat is in front of the title, make the figures leap out of the image at the viewer.