I too thought they were real at first...either way, there is something very appealing and relaxing about the idea of riding a horse at dusk...great shot.
Think about the photo before and after, never during. The secret is to take your time. You mustn't go too fast. The subject must forget about you. Then, however, you must be very quick.
Henri Cartier-Bresson
Amazing, I really like this one! And I think the only thing that gives this image away that it's not real is the tree in the left corner. Wonderful capture..