If you find the recent all-together / no-descriptions way of Google Image Search inconvenient, you can bookmark this page, or download a Desktop Gadget, to search for images in the Google Classic way of paged results, empty space between the images, and information on their size and web address.
Google classic image search:
Google new image search – but showing image size:
Google new image search – but selecting image size:
Google Classic Image Search Gadget
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