Serigraph
Create a Serigraph effect to a portrait. Here we are using a nice portrait of a kid. I also prefer to have the portrait that has a clear background. I got this one from a free stock photo site Here.
1. First, go to Image > Adjustments > Channel Mixer... Check on the Monochrome and drag the Red, Green and Blue sliders until the photo reaches the most highlighted look but be sure that the details are still there.