Start out simple, use a standard lighting setup in white (key, back, rim) - forget about all the tricks you have learnt and build it up slowly. All my old light sets (especially bought ones) dont work anymore, they look awfully bad. Set up one light after the other and dont forget the shaders - P8 thinks different. The results are more straightforward than ever before. This one above was really easy to do and I am using white planes for the lighting (somehow area lights) and a skydome for a general light.