Never did it before but a quick search of youtube and I came up with this..................
How to use Google Image Search to find information about a picture notgramma
Published on Mar 10, 2013
How to get more information about an image that you have seen online using Google Image Search. You see a picture on a webpage but want more information about it. There is no title to search with. There is an easy way to identify a picture or find a particular image in google images. This video explains an easy way to search online for an image using that picture.
You really want a twist? Try searching Logo's. I spent three days hunting a logo of which all I had was the Logo and not any words or letters to go with it. I was trying to find out who authored a report and if it had any validity....I gave up.
But on pictures I think you copy the image and use a search engine but you use the image part of the search engine; Like google images. A lot of times these days I get the search that runs right back to the place I captured the image from. I am going to have to check out the above link though....can't have to many tools.