I think some anime can look good in traditional media. Depends on what kind of media, etc etc.
Anime in oils... eh, that would be pretty awful.
Acrylics, on the other hand, would be quite good for doing an anime picture. Probably one of the best alternatives to digital because of the ability to get nice straight lines and smooth colours.
Plus, if anyone has seen the box art for the anime Samurai 7, I think it looks just fab, even though it's traditional media (I think it is anyway).
Here and here.As for the picture... I'm not really sure, but there's something I don't like about it. It just looks kinda messy, and not really shaded well. Like.. around the chin/nose areas, and in the right side of the sunglasses. I've never use gouache, but I'm still pretty sure you could have either: a. smoothed the whole thing out a lot more, or b. made it more blocky and choppy and dramatic. The way it is now... it just looks sloppy. :/