Free images results:
 

Veins pictures, stock photos and images

 
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Leaf Detail Royalty Free Stock Photo
Author: Jgar
Leaf #4 Stock Photo
Author: Jnnfrws
Leaf #3 Stock Image
Author: Jnnfrws
Leaf Royalty Free Stock Photography
Author: Hkvam
Thorn Stock Photo
Author: Andykazie
Maple  leaf Royalty Free Stock Images
Author: Jk3291
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Leg veins Royalty Free Stock Image
Author: Legger