I think part of your problem is that you have an image map node plugged into your diffuse colour channel but you don't have a map loaded in that node. I suggest you disconnect that node altogether. I suspect it's making Poser confused about what it should use as the colour map. Try disconnecting the bump map from the displacement channel and connect it to the bump channel instead. Set the bump amount to 0.1 initially and then turn it up or down from there until you get results you like. I have a pack of shaders in free stuff which includes some image map based skin shaders. You might like to check those out. There are many ways to do things with P5 materials and there's no particular reason you should use my method, but it might give you a starting point to work from.

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