Practice drawing and painting with the great planes of the head, developed by John Asaro.
To improve in your artistic journey, it's very beneficial the memorization of this head by both sides. If you want to prefection the art of portraiture, practicing from this model will help you as the great tool it is. You will not regret the adquisition of this model to your library.
You can also print this model and have a physical version. The model is closed/manifold and with a lot of detailed proportions. The original Blender file, has two lighting set ups that you can adjust to creat great lighting compositions to practice painting and drawing.
You can ask for support with this model if you need any adjustment, just send me a message.