This Pencil Draw Photoshop action works really well. It works by turning the whole photo into one that looks as if it was drawn with a pencil. The result of this action will place the sketch layer on top of the original.
Activating it will prompt you to adjust the blur of the new layer. As you adjust the blur to the left, the picture will look more like a sketch, whereas the other direction will produce a more realistic photo that simply looks black and white.
Once added to Photoshop, this action is called Propias, or Dibujo if viewing your actions in Button Mode.