One of my goals for the new year is to do more studies, including faces. I noticed I tend to draw very similar faces, which I think is the result of a very small, generalized mental library. So I'm going to include, along with other exercises, doing daily portraits from some sort of reference. This can include self portraits or from photo reference. There's plenty to be improved upon, as you can see. Here's hoping for improvement in the coming year.
Model credit goes to Longstock on DeviantArt for the photos used for reference.