Sure you can export the rendered images and use these in Photoshop. That is kinda what Poser was made for originally. You can import the textures into Photoshop and give characters painted-on clothing or new skin. Search on 'second skin' for that. You cannot import the geomety as a 3D form in Photoshop. You need a 3D paint program for that. Poser does have a facility to makeUV mapping meet projection, so paint an image on an object. This would be the inverse of what you ask but end effect is similar and can come in handy for simple objects.