Free images results:
 

Ponies pictures, stock photos and images

 
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Horse Royalty Free Stock Photos
Author: Caramaria
The Foal Stock Photography
Author: Marilyna
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Ponies Royalty Free Stock Images
Author: Vlue
Ponies Stock Image
Author: Annalovisa