This drawing is actually from a doujinshi I own. It's from one of the panels. (aka I did not draw this, wish I did though.) The original image was black and white only. I liked it so much that I scanned it in and I spent HOURS coloring it. (Mostly trying to figure out what lines were important, what was what, reinking lines, etc. Like is that his ear on the right or more hair? In the end I went with ear because I liked the look of it.)
I took colors from Naotoki's body armor to color the kimono. I reversed hair colors to make it mostly a dark green with light green as the highlight. The snake is gold ala his swords. The background color is from a screen shot of him sitting in armor without his helmet.
The wallpaper is available on my website Soul of the Seasons
under the Wallpapers section. Please view my image policy there before downloading it. Thanks.
Note: I originally colored the image to make a Naotoki fan stamp for DA out of it. But shrinking it down made it look worse. After all that work I just couldn't abandon it, so I made it a wallpaper instead.
Edit 2/21/10: Minor edits to the image to clean up a few spots here and there. You probably won't notice.
Edit/Update 2/20/14: Replaced desktop screenshot with wallpaper image.