Free images results:

Tusk pictures, stock photos and images


Elephant Stock Photo
Author: Ice
Elephant Stock Photos
Author: Ice
Elephant Stock Image
Author: Ice

Also, here are some commercial RF-licensed images that match your search criteria:  
Donald Tusk Royalty Free Stock Photos
Author: B-d-s
Tusk Royalty Free Stock Photo
Author: Atirado
Black Tusk Stock Image
Author: Drack