Though I have been using Google to search for images for about 10 years, it took me a week to use Bing as my #1 image search engine. The switch is due to both a nice interface and time-saving functionnalities. The 2 screen shots show you the search results for Oscar Wilde. On both Bing and Google you can filter the images by colour and size.  Bing enables you to select "just faces" or "head & shoulders" images as well as by layout (square, wide, tall). As I usually know what type of image I want and have very little time to search for it, I highly appreciate Bing's filters. Google comes up with more results (762,000) than Bing (188,000 results) but as I usually watch the first 2 results pages only, I don't care about the search volume as long as the results are relevant.

Ian Dodson