Thought I'd share another tutorial that I find amazing. I have played with it so much to create other really cools effects.

http://www.photoshopsupport.com/tutorials/jennifer/photo-to-sketch.html

Here's the picture I made with it.

If you set the final product on overlay to the original image it will look like a color sketch. Play with the opacity a little bit though.

Here's a small example:


I guess I'm going with the blue eyes examples today. I didn't create this tutorial. I just find it immensely useful.