Automatically generated portraits based on the Flickr photos shared under Creative Commons Attribution 2.0 Generic License (credit).
Resulted portraits are necessarily looking alike the models, even some might be hardly identifiable as faces or some appear too photographic to me, but I just let the codes do the job and didn’t manually filter anything out.
The photos are randomly download by a PHP script and scanned with ofxFaceTracker to locate the faces. The challenge is to reduce the number of strokes while making them look more deliberately placed. A good artists knows which lines are more important than others and is able to capture a shape with fewer touches, which is not very easy for computers.