Past of the problem with texture maps is that the key objects in Poser are 3D, and some parts can get very close to the camera. So a few pixels on the texture map can be covering a lot of pixels on the render. 512 pixels to map head to toe on a 6-foot man is about 7 pixels per inch. Do a Kitchener-style render of that man pointing at the camera/viewer, and it's not going to be enough. On the other hand, if it's right about memory allocation being in powers of 2, those 3000x3000 hi-res maps for Vicki are a bit silly.