Search google in "webs" for "naruto gallery", or a combination of the following words...
naruto (or the character you're after), gallery, image, screencap. You'll often get more images that way than just an image search.
As far as I know, there's...
(naruto official site)
(naruto movie official site)
...and the other one I had must have moved or something. There's a LOT more.