I don’t know… I use a lot of contrasts and while I’m not any kind of expert painter, I can usually get decent results. Scales, fur, leather, bone - these are all “easy” surfaces to work with and so Seraphon or OBR are indeed Contrast-friendly. But hanging additional trinkets on an armour-clad and cloaked human model does not make it easier to use contrasts. I would argue that it is in fact more difficult, as contrasts are not necessarily well suited for such density of different textures, materials and elements.