Free images results:

Helmet pictures, stock photos and images


Knight Stock Image
Author: Kmitu
MIG-15 Stock Images
Author: Nickr
Ant Workers Stock Images
Author: Lycan
Biker Royalty Free Stock Photo
Author: Chelnok

Also, here are some commercial RF-licensed images that match your search criteria:  

Explore more commercial options: More Helmet Stock Illustrations & Vectors | More Helmet Stock Video Footage