Create fast and easy a Sketch-Style with this great saving action called Sketch -it .
The layers based on smartfilters so you can easily adjust later the tones and detail layer.
Endless amount of opportunities to get nice results by playing around with the blending modes inside the layer stack.
Experiment .. Combine different techniques change the blending modes.. lower the opacity and so on …
I recommend to use 300 DPI Pictures with a high contrast to ge the best results …