SaintFox - ah, i see what you mean.  well, let me put it this way.  in the original, the detail and hardness of the area around the lips and the lips themselves looks uniform.  it  doesn't in the portrait.  and the transition doesn't look nearly as natural.  maybe that's not an issue of the lips being separate, but it seems like it would be?

MikeJ, i think maybe you're thinking too much about it from a developer perspective, and too little about actual rendering results. no matter what the mapping, from a user perspective (not a texture developer one)  there's only about 3 scenarios:

•  the difference in resolution doesn't matter because the extra resolution isn't needed for the render, and the uv mapping makes it all come out in the wash.  the scene wastes resources, but that's pretty common.   and the renderers for Poser 7 and up don't really care.
• the difference in resolution does matter, and is helpful because the areas that need more resolution are visually removed from those that don't, so that either the ones with a lower resolution take up less space in the render and don't need it or aren't very noticeable.  yay for variably sized maps.
• the difference in resolution creates a problem because it's needed uniformly and the textures were made with the difference in mind.  so the high detail portion has the detail it needs, but the lower detail portion doesn't.

as i mentioned before, i literally can't think of any situation where the second scenario might work for lips and their surrounding area.  if it makes it easier for SaintFox to create textures, that's really great. i think that's really important to support developers, especially for a non-DAZ figure. but i've had to spend a minimum of 2 hours postworking the neck and shoulders of just about every texture i've ever used, and i can totally understand why head and body might be handled that way.  conversely, i can think of literally zero situations in which it would be beneficial to have a visible difference in detail between lips and their surrounding area, and in no situation could the lips need detail their surrounding area didn't because they render right next to each other. 

unless she were an aardvark.  then it would be another situation altogether.