James McAvoy

So this is basically my first male portrait! So all the critique I can get would be amazing. I'm really trying to improve my skills in the portrait area. I'm not entirely thrilled with part of his hair, but i'm pretty happy with the rest of the drawing.
It's based on a picture of James McAvoy. Although he looks older here. I'm also trying to get better at imitating real people. Cause they never really turn out to look exactly like the model But I'm trying! I promise!
Please critique! I'd love all your insight!