The Bargue method is one of the most rigorous drills in classical art training: you copy plaster-cast studies — usually of antique busts or fragments like the one here — using a fixed grid or plumb-line system to transfer proportions with total accuracy, then build the form purely through value, working from the lightest light to the darkest dark without ever relying on outline to describe volume. What makes it so demanding is the discipline it forces on you: every plane shift, every subtle gradation from bone to shadow has to be observed and placed correctly, often over many hours or days on a single drawing, with no shortcuts and no room for guessing. It's tedious in the moment, but that tedium is exactly the point — spending that long staring at how light actually behaves across a form recalibrates your eye in a way nothing else does, and the payoff shows up later in every other kind of work, whether it's a portrait, a 3D asset, or a shot you're lighting for animation, because you've trained yourself to see structure and value the way a camera or a sculptor would rather than the way memory tells you a face "should" look.