Looks OK to me. You went for a rough look. Turn out great. 1 nose wing (left one) could pushed upp a little bit i think..the eyes could deserve little more attention. But overall it looks great. Well done!
Great as likeness apparently (although I don't know him), probably Artrages helpful features were useful supporting such successful outcome.
Brushstrokes may be improved, once You get more confident, to better show Your specific dexterity and personality.
Congrats!
Panta rei (everything flows)!
Reminds me a little of the style that Van Gogh used for some of his self portraits. I like the contrasty, rough brush strokes though, as well as the color and lighting. Good job! You say this is your first portrait in AR, so I'm just curious to know if you've done portraits in other software or perhaps with real media?