First, open Adobe Photoshop. Before doing anything, you might want to change the color to a different one, and the background to white (or else you might not like the color when you make the sketch). Take an image. I chose this one:

Next click filter, sketch, graphic pen.

This thing should come up. You can change how the lines go (right diagonal, left diagonal, horizontal, and vertical), the stroke length, and the light/dark balance. Then click OK.

And this sketch should come up!

~Lili