Portrait Drawings

I have 3 portrait drawings here that I have done for Intermediate Drawing class this week.

First one is of the model we had:

This one is a comparison drawing of the model and our Professor that was a partner project, another girl from class and myself switched off drawing and correcting each other on these two faces:

and lastly is my self portrait I did for a assignment that is due tomorrow, sadly, She didn't want us to add shading to it or value, so it looks pretty flat with just line.

thanks for looking!
-Serena