To improve my portraiture skills, I worked on a female character, which, as Mike Kelley has said, is more difficult.
I used again one of the "This is not a real person" images (# 324). I don't have Photoshop, and I wanted to tone down the highlights on the image. I found a way to do this In Paint Shop Pro using an Adjustment layer that controls Luminancy. (I will write that up some day.)
I used Gigapixel to enlarge the image to 2k x 2k, which I then fed to Head Shot. The resulting face was a bit too smooth, so what I did is combining the regular normal map with the normal map for the old woman face, which I added as a second layer in my graphics program. You can then use the Opacity of that layer to control the contribution. This will give you sort of a middle-aged normal map. I then added various wrinkle morphs.
The hair was problem because I didn't have the right hair for my character. So I created the hair with the Head Shot Auto setting and then used a regular hair texture to give it some structure. I also set the hair to Digital Shader Hair.
A final feature of the portrait is that I gave her small pearl earrings, which I made green (emeralds?) and to which I applied the Digital Hair Shader. This gives a nice surface scattering effect with back-lighting.