My creative methods are a bit unorthodox...
I make sloppy featureless 3D models, pose them, grab screenshots and then trace; redrawing messed up bits while using reference for finer details like faces, hair, clothes, etc.
In practice, it looks something like this:

I've held onto a few of my better blender modes and decided to package them up for supporters. I hope ya find these handy for your own creative endeavors.
