You are doing several things wrong.
Color maps should plug into your very first node "diffuse color" set the strength to 1 and and the color box that is now black change to white.
Your color map should not plug into bump, bump should plug into a greyscale version of your face map.
If you want to use a specular value for your model blinn would be the appropriate choice set to a fairly low level and the little color box should be white or a shade of grey but not black.