As a first year student at Grand Central Atelier I have been practicing figure block-ins with the aid of my teachers, Brendan Johnston, Patrick Byrnes and Josh LaRock. They have shared advice with me on an efficient approach to the block-in process that has been passed down through the teaching of Jacob Collins and other instructors.
I had a discussion with Patrick Byrnes about what can help to retain an open awareness to the specific qualities of shapes and learned about the importance of searching for the exact shapes through constant questioning of all the shapes together. Through continuing to question the particular qualities of shapes on the visual image the block-in becomes more clearly revealed. The more the shapes are questioned through investigations the more truth is revealed in the answers found.
Below is an image of another portrait block-in drawn at Grand Central Atelier made using the same process. Images of this process on figure drawings can be seen here.