Google have upgraded the image search with a new concept similar to Google goggles.Now you can upload images to Google and search the images similar to yours, Google search engine will find the closest match to your image from the web and displays it.
Steps to Google search by image
Goto images.google.com
If you use modern browser like chrome you can easily drag images in your computer and drop in the search bar.
For other browsers you will find a camera icon 
at the right end of the search bar.Click the camera icon and you will get upload image option.
Choose file and then click search.
You can also enter the image URL to search the similar image.
Download a browser extension for Google Chrome or Firefox to search by any image on the web, by right-clicking on the image.
Note: If you cant find 
icon,please wait as the service rolls out to every country.
(Via)
