Adobe Photoshop is an amazing application. One of my favorite elements in Photoshop is the ability to create "Actions" and then with a press of the play button to execute a series of tasks within Photoshop to create the desired effect. I use it all the time.
Just recently, Adobe has made a great action available for free! It's an action that changes a photo into a drawing. What's cool about it is that it is customizable so you can adjust the drawing look the way you want. It's featured in the recent Adobe Create magazine in an article written by Terri Stone. You can read the article here:
This article also provides the link to download the free Action. And here is a brief tutorial by master Photoshop user Nuwan Panditha who takes you through the basics of using the Action script. Check out Nuwan's (also known as BlackNull) artist profile at Adobe, too. He's very, very talented.