Free images results:
 

Head pictures, stock photos and images

 
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Horse Head Royalty Free Stock Photos
Author: Tmcnem
Stag-head Stock Images
Author: Michaf
Duck Head Royalty Free Stock Photos
Author: Michaf
Puppy head Stock Photos
Author: Yannp
Lion guard Royalty Free Stock Photo
Author: Knips
Ostrich 03 Royalty Free Stock Photography
Author: Zevark
Camel Stock Image
Author: Bmpix
Lunch Time Stock Images
Author: Bigo
Bull Snake Royalty Free Stock Image
Author: Bigo
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Horse head Royalty Free Stock Photography
Author: Gajus