**Detailed stroke-width measurements from the Tree Oil Painting**
The red circle marks the brushstroke zone in the upper foliage area of the Tree Oil Painting. The enlarged image below presents a technical breakdown of both single and grouped stroke widths within that area. Measurements demonstrate deliberate torque, curved direction, and variation in pressure, ranging from 0.56 cm to 1.02 cm — consistent with master-level control.

📍 *This stroke zone corresponds to the background motion in Van Gogh’s Self-Portrait (1889), shown in the previous image.*