If you are on a desktop  just right click on the picture than select " image search "  

Or saved the images  than go to google.com.  If you are using a mobile device make sure u request view as desktop  in order  for it to work.  
Once you're on google.com.  Look  to the  
 top right corner.  U will see " gmail " " Image"  
Click on the image link "  it will direct you to a google image search.    Click on the "camera icon " than just upload the picture from your device  than  hit search