I really like the intensity of the eyes. And, I like the use of the fine line in the hair and beard.It gives your picture a 3-D effect.
You have some great shading going on the right sided nose. I wonder what it would look like if you use the same technique on cheeks.
Great subject matter and I can see you have a lot of passion in your painting style.
I am just starting digital painting myself, so I cannot and your questions about Artrage vs. real-life.
We all learn by sharing what we know.