...are what happens when you're late for a portrait session. People who are on time for the session get their choice of where to set up, and that usually means a spot right in front of the model. Latecomers have to take what's left, which often means a spot on the periphery. There's nothing wrong with profiles of course, but you learn a lot more by studying the human head, and face, from many different angles. If you're always late for the session and always get stuck way over on one side or the other, you'll probably only get really good at profiles.
10" x 8" Oil on Panel
Here's a couple profile portrait studies in oil paint I made at the portrait sessions last month. Both are painted with a limited palette of yellow, red, and black, plus white. Sometimes I'll do a profile portrait because that was my choice. Other times I'm just late.
For more about portrait sessions, go to "Labels" on the side bar and click on "portrait", "sketching" or "drawing."