Free images results:
 

Citron pictures, stock photos and images

 
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Lemon Royalty Free Stock Photography
Author: Radovan
Fruit Royalty Free Stock Photography
Author: Pamelajane
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Citron Royalty Free Stock Images
Author: Kenjii2011
Citron Royalty Free Stock Photography
Author: Reika7
Citron Royalty Free Stock Photography
Author: Reika7