Creating a realistic face is among the most challenging things you can do in 3D. Hats off for that and compliments 
The steps would be:
- sculpting with good anatomy (or vertex modeling, but that would be more difficult, once you got into sculpting)
- retopologizing (obviously not necessary if you start with vertex modeling)
- uv unwrapping
- texture painting
- hair grooming with particle hairs
- shading, look development & lighting
- rendering
All the steps can be done in Blender. And, after that you’ll be through the whole pipeline. For each step there are plenty of tutorials on the net.
rybergs, the creator of the amazing piece you found, has documented his whole 3 month’s process in his WIP thread: going realistic
Maybe this thread is a good start and if you create a WIP thread of your own you will receive plenty of help on the way, for sure.