AFAIK there is no way to do professional-looking anime-style shading in Poser. It's necessary to use Photoshop (or similar) to draw good lines and clean up the edges of the color zones. Compiler, Trekkie girl et al. have prepared some very nice toon shaders for P5/6, but they have to be augmented by corrective work in Photoshop IMO if the result is to look like a professional anime illustration.