That happens when a bump map is applied in the wrong format. e.g. if you're using Poser 4, the bump map for the head has been applied in .jpg format instead of .bum Go into your material editor, and re-apply the bump map by clicking "load". Poser should prompt you to convert the file to .bum format. Click yes and all should work fine. Alternatively, you could just turn off the bump maps altogether. Unless it's for close-up renders, you'll usually find very little difference.