Thanks for the info! I'm still playing around with settings, but it doesn't look as if the displacement is going to offset the fact that the texture doesn't look very realistic close-up. I'll have to play around with other things to see what can be done to improve how it looks. It's so irritating how useless the Poser manual is for the Material Room. There isn't even any mention that black is zero displacement.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon