SSS is just how light is distributed on translucent surfaces, a good light set up is often key to getting good SSS effect.
sss is not a skin tone and is not always needed.
here is a good start,
create a blinn shader, assign it to your head,
remove the default reflection and turn it to 0
remove any specular highlights on it.
give it a color of RGB: 220 165 170
create a basic 3 point light set up.

open the hypershade

select your head mesh, and in the hypershade shift select the blinn,

then bake out a tecture (in hypershade: edit>convert to file texture)
turn on keep lighting and shadows and bake a 1024 map.

then bring it to photoshop and start tweaking.

then maybe u can use your color map in conjunction with a SSS shader .