Hi there

Here is quicker render at 50 samples,its postworked in CS6(only levels,nothing more),used brighter HDRi with intensity of 3.0,with 2.0 render has looked OK,I've used for skin EZSkin 3

If you want to have shadow catcher for ground etc,I think Boni posted thread how to do it there,I will try to find that older thread

Hope this helps

Thanks,Jura