Arm proportion
A cross reads first as two bars with a clear length relationship. Stencil viability comes from one stable vertical axis, a deliberate crossbar position, and flared or straight ends that survive reduction, not from copying carved texture or photo shading.
Check: Cover all interior detail. If the bare silhouette still reads as the intended cross family at a glance, the proportion is sound. If it collapses into a plus sign or a blurry dagger, fix arm length and crossbar placement before judging anything else.
