Most of the time, there isn’t much information available within the picture itself. However, certain smartphones (iphone) and high-end cameras have GPS built in, and geo-tag pictures. Advanced cameras also store metadata such as the model name, exposure settings, etc. Even without the location information, the Exchangeable Image File format (EXIF) info stored on the image is still useful in the evidence gathering process.
In Firefox, right click on the image and select Copy Image Location.
Go to http://regex.info/exif.cgi and paste the image location into the Image URL box. Now click on the View Image at URL button.
The next page displays EXIF info, or information on the Camera, and, if available, the GPS-based location where the picture was taken. Scroll down for the GPS info or click on the map service link in the box on the left side of the page.