My project for course: Artistic Portrait Drawing: Capture Authentic Expressions

For a learner, I am fairly pleased with these though I had difficulty with rendering. The facial features proportions were challenging, particularly around the mouth I found.
On the portrait of George Harrison I feel that some areas are too dark and others are not dark enough. On the portrait of Princess Leia, I definitely got some of the sizing skewed around her mouth.

All in all, I am fairly satisfied with them and greatly enjoyed the course. I intend to continue with my portrait drawing practise. Are there any other Domestika portrait courses as excellently explained as this one, that people could recommend?