I decided to do a study of lips. Really, just to do something a little different. It turned out alright. Not mind boggling, but not bad. The darker set were done from a photo reference. The lighter set were done entirely from my imagination.
Working with the photo reference I used the color picker to take the colors directly from the photo. I did this after initially doing the colors on my own. I was surprised how far off my values were. I see now that I have a tendency to make things lighter than they really are.