Here are some exercises that will help you understand the human face and its transformations in movement:
Tip: you imagine the head as being deconstructed in basic, simple forms like: spheres, cylinders and cubes: follow the same principles and it will be easy for you to understand and then to easily draw from your imagination any portrait in any position. Anyway, first you should trace the axes, then we try to figure out the primary forms that could help us represent the head and then we will step into the details. Let’s pay attention to the 3 positions in which every object can be observed. We have the aerial view – also named the bird view, the frog view (in these 2 cases, the axes are like ellipses) and the view when all the axes are parallel lines – this means the model is at the height of our eyes.
Image: Andrew Loomis – “Drawing the Head and Hands”