I enjoyed following along with "Secrets To Drawing Realistic Faces" by Carrie Stewart Parks.
Chapter 5 - Shade
Carrie teaches us to use values to shade our self-portraits which really gives dimension to our drawing.
Chapter 6 - Drawing Eyes
This chapter and the remaining chapters refine what we already know adding additional tips and measurements. This chapter gave my eyes life and you should be able to see the difference. I did.
Chapter 7 - Drawing Noses
Again, some refinements to my nose created a more realistic nose,,,pug that it is :)
Chapter 8 - Drawing Lips and Teeth
More expounding on lips and teeth to make a more realistic portrait.
Chapter 9 - Drawing The Head
Explains the difference between adult and child heads and between male and female heads. Much good info here.
Chapter 10 - Drawing Hair
Good chapter, discusses hair types, shades and highlights.
All in all this is the best book I have read on portraits. I learned a lot and I think the difference between my before picture and my after picture is astounding. I will be looking for more books by this author. Thank you Carrie!
My apologies to anyone who picked up my post with Babylon information embedded in the text. I think I inadvertently caused this and have since removed the offending code.