Hi Clayton,
I agree with Sarah-Jane that you've captured the gaze/expression. As we know from the Mona Lisa, that is an accomplishment. Even so, I think your next portrait would benefit from some anatomy study. I am attaching a link that identifies parts of the lips and the space above the lips. You've drawn the top lip too flat across. It is missing the part called the cupid's bow and it is also missing the philtrum, which is that dimpled area directly under the middle of the nose that flares into the cupid's bow. You'll find many examples if you image search "philtrum." Keep drawing!
https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAU
[Clayton, I forgot the link and now I' m realizing it ties into an advertisement, but I'll leave it here because it serves the purpose I intended, but also gives some other pictures of lips in the process]
Jim