I drew Sasuke by eye on paper with a pencil, then scanned it in and applied the Dark Strokes effect in Photoshop. I drew him without his new MS because I don't like the look of it and was originally intending to give him a better design I came up with, but didn't bother in the end. I also think the shading on the neck sucks... it's never been my strong point.
Edit: I figured out what was wrong with this picture, why it looked rather flat: Sasuke needed his eyes coloured in. This looks much more 3 dimensional now.