For the class project, I've create a page of drawings for each facial feature. I drew both from reference and from imagination and tried to practice different angles and perspectives.
Page of eyes:
Two page of noses since I wanted to practice both methods:
Page of mouths:
Finally a page of ears:
Don't forget that there are reference images of the skull for you to download. Taking a look at these will help you better understand the placement of each feature and how they connect to the head. There are also links to photography for reference.