Creating an old mans head - sculpt

Working towards realism where I'm trying to understand how the wrinkles and pores work together to really make it believable. I also want it to be proper retopologized, so that I can render it in Maya later as I am trying to learn Maya too in the process. 

I have sculpted the head non symmetrical and working now with topogun to retopo the sculpt. This takes some time as I have to do everything twice, but in reward, it makes the result much better as we humans are not symmetrical. I started on the pores and more fine details  but I wasn't happy about them, so I smoothed them out and will start the fine detailing after the new topology.

Old Version before retopo

Retopo process so far

Finished a-sym topology

Finished sculpt (not textured yet)

Closeup

SSS update!

The SSS are now finally starting to get to a stage where I am quite satisfied. I did a 4k render today, and it looks really good! However, I need to create a better unwrap before on my next projects.

Most of my day have been devoted on the shader, and I have done so many different renders and changes that I finally believe i can write with good conscious that I understand the shader quite well now. However, there are still more to render and more to understand..

Anyways, here's the result :)