Another place to try is Planet Figure: http://www.planetfigure.com/
There's not a specific category in their forum for anime, but it's a forum for painters, and there are many posts (a search at the top level of the forum returned a good number of articles) asking about this technique or that, in which the poster was working on an anime subject.
Of course, as it is across the modeling hobby, techniques used in one subject are probably applicable to most other subjects.
Regards,
Brad