The Live Search Images team recently released a fun new feature to make it easier to find specific kinds of images. To use the feature you simply have to add a filter your query, like so:
Portrait results return head and shoulders images. For example: ‘Rajinikanth filter:portrait’
Face results are closer shots with the face the most predominant element of the image. For example: ‘Aishwarya Rai filter:face’
Black and white results are pretty self explanatory. Example: ‘night skyline filter:bw’
You can even combine some of the filters: ‘George Washington filter:face filter:bw’