Hi Lisa,
This is very nice. I know this isn't the Critique section, but you might want to use some darker values throughout (eyes, hair shadows, etc.), for more contrast & depth. As it is now, the nostrils have the deepest values. Maybe you can persuade your model to do another sitting?
Your pose, lighting, and drawing skills are all great. If you decide to revise it, I'd love to see it.
Best wishes,
Hybrid Mode
