Free images results:
 

Conch pictures, stock photos and images

 
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Snail Royalty Free Stock Image
Author: Olgak
Seashell Royalty Free Stock Photo
Author: Ovisopa
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Conch Royalty Free Stock Photo
Author: Tabgac
Conch Royalty Free Stock Photo
Author: Yio