There are advantages and disadvantages in using Google Image Search:
There is no standard meta-data accompanying images.
Google cannot grant you any rights to use images for any purpose other than viewing them on the web.
Accordingly, if you would like to use any images found through Google, you must contact the site owner to obtain the requisite permissions.
Google cannot make adequate assessments of the aesthetic quality of images they index or an image's suitability for your particular purpose.
Visual search engines search for images using image and visual matching technologies, rather than text/keywords, tags, or text.
Idée Inc develops advanced image identification and visual search software. The technology looks at the patterns and pixels of images and videos to make each image or frame searchable by colour, similarity or exact duplicate.