We dish out some of our bets tips for turning a photo into an illustration-style effect
First open an image and hit Cmd/Ctrl+J to duplicate the layer. Click Cmd/Ctrl+U to open the Hue/Saturation and set Saturation to -100.
Duplicate the image again and click Cmd/Ctrl+I to invert, set the blend mode for the layer to Color Dodge.
With the Layer 1 copy still active, go to Filters and apply the Gaussian Blur to bring the contours back, setting the Radius to around 5 pixels.
Grab the Layer 1 and drag above the Layer 1 copy. Go to Filter>Stylize and apply the Glowing Edges filter, setting the Width Edge to 1, Edge Brightness to 20, Smoothness to 15, and hit Ok.
With the layer 1 still active, press Cmd/Ctrl+I to invert and change the blend mode to Multiply. Click on the Background layer and hit Cmd/Ctrl+L, drag the sliders to increase or decrease the contrast.