I’ve been trying to sketch anime expressions, but they still feel kinda stiff even when I change the mouth shape. I feel like my facial anatomy and shape language might be the problem. If I’m practicing with procreate, what should I focus on to make my expressions feel more dynamic?

I’ve been trying to sketch anime expressions, but they still feel kinda stiff even when I change the mouth shape. I feel like my facial anatomy and shape language might be the problem. If I’m practicing with procreate, what should I focus on to make my expressions feel more dynamic? | Artwod Feedback