3D Head Scan resources

You can download a HD scan of a 3D head, along with the proper skin shaders for Unity here:
http://ten24.info/skin-shading-in-unity/

You can download the latest version of Unity here (free): https://unity3d.com/

With a few Youtube tutorials it shouldn't be too difficult to set up some lights and test out how different light colours and ambient light colours affect skin. Good luck!