I did an experiment with this recently, have a look in my gallery. The thing I found is to break up the highlight, shininess and relflection channels with a bit of noise - either a noisy texturemap or a procedural noise within Carrara. This helps break up the highlight edges. Also check if there's a bump map for the figure as well, that helps break up highlights, I think Transposer does the best job it can with importing Poser stuff, but as Poser doesn't seem to play nicely with other software you'd be better off checking everything yourself. Giving the colourmap a bit of variety by mixing two slightly different versions of the original will help give the figure a bit more life as well. Regarding the lights - different lights are going to give you different effects. If you are going to use spotlights and bulbs then you might want to experiment with soft shadow options. Most of the loungeroom presets seem geared towards soft lighting - HDRI and environment lighting will give you a similar soft lighting effect. Sun light and a realistic sky seems, IMHO, to have the best balance between hard & soft highlights/shadows.