Free images results:
 

Fist pictures, stock photos and images

 
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Tough guy Royalty Free Stock Photography
Author: Yanc
Boxers Royalty Free Stock Photos
Author: Lycan
Thumbs up Royalty Free Stock Photo
Author: Freds
Hand Stock Photography
Author: Chrisharvey
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Fist Royalty Free Stock Images
Author: Milesdavies
Fist Stock Photos
Author: Pixelbird
Fist Royalty Free Stock Images
Author: Tribalium
Fist Stock Photos
Author: Meduzzu
Fire fist Royalty Free Stock Photography
Author: Rasomon