Google is now testing a new interface for search results in tablet as per their blog post. According to their post, they simplified the layout of search results pages and increased the size of page contents like text, buttons and other touch targets to make it faster and easier to browse and interact with search results in portrait or landscape view.
Image results, is now focused on improvements that enhance the viewing experience such as enlarged image previews, continuous scroll, and faster loading of image thumbnails as shown below
As of this post, I have tried to search through my Galaxy tab and it is not working as mentioned above. I think the interface will one be available to iPad and Android 3.1+ tablets across 36 languages. So I hope that soon I could try this out.