Giacometti painting a portrait

Do you know the part i enjoy the most ? Seeing his arm fully extended holding his brush. Somewhat as he wanted to reach a tiping point. Something that could break anytime. :)

And an interview of Paola Carola, one of Giacometti's modele : https://www.theartnewspaper.com/2011/04/01/he-enabled-me-to-know-myself-better-interview-with-giacomettis-last-surviving-muse-paola-carola