The grayscale layers used in the portraits have some very convenient properties. For example, to randomize skin or hair color, I just have to multiply the corresponding layer by a float factor (between 0.5 and 1.5 for hair). I also added new layers to support jewelry.
Following Mingos advice, I changed the eyes so that they look less manga. The eye/mouth/eyebrows still have only one version.
Women, women, are there no men in Doryen ? Well, before I start another set of layers, I want to be sure that I have explored all the procedural possibilities.