Done within a classmode of 30 mins
That's the most marvelous job on your faces and expressions sketches, Naima, but these faces and facial features are still not caricatured enough or exaggerated enough yet. How would you like to go for loosening up your faces and features with 30 minutes of 2 minute drawings?
As a result, your understanding of your facial features will be quickly sketched out less stiffer but more fluider than you've ever drawn before. For most details, look into a free PDF or a physical book on Amazon called Action! Cartooning, by Ben Caldwell.
My hat's off to you!