Interesting... this is my first ever render of M4, using the default textures. Poser Pro 2010 with render GC switched on for a quick IDL render. I agree the textures are weird concoctions, but they seem to render reasonably well under this lighting. Min shading rate was 1.0, and I switched off all texture filtering.

This is using my own modified version of bagginsbill's IDL Soft Light Studio, available as a Poser scene from his web site. I highly recommend you download it and do a few test renders. I also use the EnvSphere with a controllable gradient shader which I usually have fairly desaturated, as here. 

There is something funny about M4's skin from abdomen down to mid thigh, but I don't have time to look into it right now.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)