Hi resolution maps need to be rendered in a high resolution to look their best. As for the glossy lips, etc. It is very possible that the merchant did a little bit of postwork to the promotional image. Poser 5 does have a "Glossy" node that you can add to your lip texture but I have found this can be a little too extreme for most of the work I do. Postworking a video clip is more difficult but there are applications out there such as Adobe After Efects that can help you... not cheap though.