Upper outer arm
Broad panel from shoulder to above the elbow
The largest single arm field. Muscle padding keeps the surface relatively even along the vertical axis, so larger focal motifs, bolder linework, and vertical compositions hold their read here. It also gets the most daily sun of the arm zones.
Check: Center the focal on the flattest span, run the long axis with the limb, and judge sun-facing line mass at true size before print.
