Using this thoroughly explained, detailed photoshop lesson, you will see how to create sketch photo effect.
First, find any photo which you like to use for this lesson and open it in Photoshop.
Duplicate now your layer (CTRL + J) and choose Filter > Stylize > Glowing Edges. After that, make the adjustments as follow:
Set the blending mode to Soft Light and after that choose Layer > Merge Down.
Choose now Image > Adjustments > Auto Color and duplicate layer once again.
Choose now Filter > Blur > Motion Blur and make the adjustments as follow:
Go now to Image > Adjustments > Levels and make the adjustments as follow:
Set now the blending mode to Vivid Light.
You should now have something like below.