In agreement with latexluv on the specularity.  I just ran a quick test with EZSkin and concentrated on the blinn settings to control the overall specularity.  By decreasing eccentricity, SpecularRollOff and Reflectivity, you can get the skin to respond to light as close to realistically as possible.  The problem with eccentricity values is, if set incorrectly, would make a light source appear closer than it actually should.  Outdoors, the sun should not cast such stark specular highlights; balancing the blinn to lower values should improve better skin tones.