Free images results:
 

Serpent pictures, stock photos and images

 
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Dragon 3 Royalty Free Stock Photos
Author: Caraman
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:  
Serpent Stock Photography
Author: Wirotxma
Serpent Royalty Free Stock Photos
Author: Juti