Free images results:
 

Yawn pictures, stock photos and images

 
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Dog Stock Image
Dog
Author: Ichtor
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Lion, yawn Stock Photos
Author: Pokec
Yawn Stock Photography
Author: Laozhang
Yawn Royalty Free Stock Photography
Author: Soupstock
Yawn Stock Photography
Author: Millaus
Pug yawn Stock Image
Author: Dreymedv
Yawn 478 Stock Images
Author: Bowie15
Woman yawn Royalty Free Stock Photos
Author: Mathom

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