Hi Mike, or should I say the "Prince of Darkness"
You've done a good job so far! Here are the nit-picky things I noticed: on the left eye (my left) if you placed a bit more shadow on the corner of the eye below the eyebrow, it would help the eye to recede more. Both eyebrows need to be a little thicker and the highlight in the right eye is a little too light. And it looks like the area between the nose and upper lip is a little too long. (Maybe the nose needs to be bigger?)
You've got a good start to an excellent portrait. I'm looking forward to your choices of colors. The photo has beautiful areas of violet in the shadows.
I hope this helps.
Renee Price