I've always thought it best to convert the original texture to greyscale, increase the contrast on it a bit, and use varying shades of darker greys to make the bump effect. If you're wanting to make a skin bump for things such as pores, try doubling the dimensions of the texture, and adding monochromatic noise (just a touch!)Increase the contrast to make the "noise pixewls" stand out more, if you want a more "rough-hewn" skin texture. Also, play with the bump map slider in the Surface Materials section of Poser. Hope this helps! Jon