For this week's free Photoshop technique, Deke McClelland takes an ordinary portrait shot, applies several filters (two of which he claims to never use under any other circumstances), and transforms the photo into an "ink drawing." By way of Gaussian Blur, Smart Blur (there's one), High Pass, Notepaper (there's the other), and yet more Gaussian blur, you'll learn how to take a photo like the one on the left and achieve a pen-on-paper effect like the one on the right.
http://www.deke.com/content/deke’s-techniques-016-turning-a-photo-ink-drawing