According to a Google representative, this ad unit is being introduced because people already use image search as a starting point for shopping.

1. Google Starts Showing Google
Ads In Image Search

2. Google, the search engine juggernaut is all set to expand reach of its advertisements.
Now, images will also be coming in the periphery of Google ads. In a report
published in Business Insider, it has been said that, for the first time ever, Google is
rolling out advertisements to Google's image search results.
The roll out is starting at a slower pace. In beginning of the roll out, it will show
up shopping ads in appropriate image searches. The ads published in Google's
image search will occupy an entire line of screen space which would otherwise
have been grabbed by images.
The company has officially rolling out the new Product Listing Ads for image
search. With Image Search being part of the Google Display Network, your PLAs
will be automatically eligible to be displayed in image search results, provided your
shopping campaign is opted in to Search partners.
Read More: http://www.brainpulse.com/articles/ppc-management/google-
showing-ads-in-image-search.php

3. www.brainpulse.com
Phone: 01206790400
sales@brainpulse.com