Excellent work Kuato!
That left eye is perfect! Excellent life to it.
I might blend the hair more to that nasty green, almost yellow, at the tips, more than the gold you have used, but I know why you used it. His hair always looks like the green is washing out, so the tips have more, and the roots are more his normal hair color.
Not shabby! Try a touch more black in the eye outlines areas for "earlier" shots and a more pure cherry red on the lips, but he looks astonishing otherwise. Makes me happy I got a HT one coming now. You've sold me on it's likeness possibilities.
By the time you get to the heads by Chris, you'll get your practice alright!
Can't wait to see your work on these! GREAT start!