Free images results:

Riding pictures, stock photos and images


Horse Royalty Free Stock Photography
Author: Caramaria
The Foal Stock Photography
Author: Marilyna
Horse Stock Photos
Author: Darac
Lunch Time Stock Images
Author: Bigo

Also, here are some commercial RF-licensed images that match your search criteria:  

Explore more commercial options: More Riding Stock Illustrations & Vectors | More Riding Stock Video Footage