Looks good! Did you use a brick node? My only critiqueis that the scales look too "regular" such as on the forearm where they look too well lined up. By contrast, the nose looks great. Try using the cellular node, modes of which gets pretty even squares or circles. You can then adjust the jitter for some randomness, then connect that node to the bump and displacement attributes. Also connect it to a color node and add your light and dark colors, the connect the color node to the root node's diffuse, etc. attributes.